On July 1, 1963, the United States Post Office introduced the Zone Improvement Plan, or ZIP Code.ZIP codes are five-digit numbers that designate an area for the United States Postal Service.
ZIP is an acronym for Zone Improvement Plan.
A ZIP Code is a 5-digit code that identifies a specific geographic delivery area.
ZIP Codes can represent an area within a state, an area that crosses state boundaries, or a single building or company that has a very high mail volume.
See all Zip Codes by State and principal US territories
ZIP Codes in Maryland listing, with city state and county
Cities listed with each zip code are the major cities in Maryland
| Zip code | City / State | County | Iso | Area code | |
|---|---|---|---|---|---|
| 20588 | Dhs (Maryland) | Howard | US-MD | 240 / 301 | |
| 20601 | Waldorf (Maryland) | Charles | US-MD | 240 / 301 | |
| 20602 | Waldorf (Maryland) | Charles | US-MD | 240 / 301 | |
| 20603 | Waldorf (Maryland) | Charles | US-MD | 240 / 301 | |
| 20604 | Waldorf (Maryland) | Charles | US-MD | 240 | |
| 20606 | Abell (Maryland) | St. Mary | US-MD | 301 | |
| 20607 | Accokeek (Maryland) | Prince Georges | US-MD | 301 | |
| 20608 | Aquasco (Maryland) | Prince Georges | US-MD | 240 | |
| 20609 | Avenue (Maryland) | St. Mary | US-MD | 301 | |
| 20610 | Barstow (Maryland) | Calvert | US-MD | 410 | |
| 20611 | Bel Alton (Maryland) | Charles | US-MD | 240 / 301 | |
| 20612 | Benedict (Maryland) | Charles | US-MD | 240 | |
| 20613 | Brandywine (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20615 | Broomes Island (Maryland) | Calvert | US-MD | 410 | |
| 20616 | Bryans Road (Maryland) | Charles | US-MD | 301 | |
| 20617 | Bryantown (Maryland) | Charles | US-MD | 240 | |
| 20618 | Bushwood (Maryland) | St. Mary | US-MD | 301 | |
| 20619 | California (Maryland) | St. Mary | US-MD | 301 | |
| 20620 | Callaway (Maryland) | St. Mary | US-MD | 240 / 301 | |
| 20621 | Chaptico (Maryland) | St. Mary | US-MD | 301 | |
| 20622 | Charlotte Hall (Maryland) | Charles | US-MD | 240 | |
| 20623 | Cheltenham (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20624 | Clements (Maryland) | St. Mary | US-MD | 240 | |
| 20625 | Cobb Island (Maryland) | Charles | US-MD | 240 | |
| 20626 | Coltons Point (Maryland) | St. Mary | US-MD | 240 | |
| 20627 | Compton (Maryland) | St. Mary | US-MD | 240 | |
| 20628 | Dameron (Maryland) | St. Mary | US-MD | 240 | |
| 20629 | Dowell (Maryland) | Calvert | US-MD | 410 | |
| 20630 | Drayden (Maryland) | St. Mary | US-MD | 301 | |
| 20632 | Faulkner (Maryland) | Charles | US-MD | 240 | |
| 20634 | Great Mills (Maryland) | St. Mary | US-MD | 240 / 301 | |
| 20635 | Helen (Maryland) | St Mary | US-MD | 240 | |
| 20636 | Hollywood (Maryland) | St. Mary | US-MD | 301 | |
| 20637 | Hughesville (Maryland) | Charles | US-MD | 240 / 301 | |
| 20639 | Huntingtown (Maryland) | Calvert | US-MD | 410 / 443 | |
| 20640 | Indian Head (Maryland) | Charles | US-MD | 240 / 301 | |
| 20643 | Ironsides (Maryland) | Charles | US-MD | 240 | |
| 20645 | Issue (Maryland) | Charles | US-MD | 240 / 301 | |
| 20646 | La Plata (Maryland) | Charles | US-MD | 240 / 301 | |
| 20650 | Leonardtown (Maryland) | St. Mary | US-MD | 240 / 301 | |
| 20653 | Lexington Park (Maryland) | St. Mary | US-MD | 240 / 301 | |
| 20656 | Loveville (Maryland) | St. Mary | US-MD | 301 | |
| 20657 | Lusby (Maryland) | Calvert | US-MD | 410 | |
| 20658 | Marbury (Maryland) | Charles | US-MD | 240 | |
| 20659 | Mechanicsville (Maryland) | St. Mary | US-MD | 240 / 301 | |
| 20660 | Morganza (Maryland) | St. Mary | US-MD | 240 | |
| 20661 | Mount Victoria (Maryland) | Charles | US-MD | 240 | |
| 20662 | Nanjemoy (Maryland) | Charles | US-MD | 240 / 301 | |
| 20664 | Newburg (Maryland) | Charles | US-MD | 301 / 240 | |
| 20667 | Park Hall (Maryland) | St. Mary | US-MD | 240 | |
| 20670 | Patuxent River (Maryland) | St. Mary | US-MD | 240 / 301 | |
| 20674 | Piney Point (Maryland) | St. Mary | US-MD | 301 | |
| 20675 | Pomfret (Maryland) | Charles | US-MD | 301 | |
| 20676 | Port Republic (Maryland) | Calvert | US-MD | 410 / 443 | |
| 20677 | Port Tobacco (Maryland) | Charles | US-MD | 240 / 301 | |
| 20678 | Prince Frederick (Maryland) | Calvert | US-MD | 410 / 443 | |
| 20680 | Ridge (Maryland) | St. Mary | US-MD | 240 / 301 | |
| 20682 | Rock Point (Maryland) | Charles | US-MD | 240 | |
| 20684 | Saint Inigoes (Maryland) | St. Mary | US-MD | 240 | |
| 20685 | Saint Leonard (Maryland) | Calvert | US-MD | 410 | |
| 20686 | Saint Marys City (Maryland) | St. Mary | US-MD | 240 | |
| 20687 | Scotland (Maryland) | St. Mary | US-MD | 240 | |
| 20688 | Solomons (Maryland) | Calvert | US-MD | 410 / 443 / 667 | |
| 20689 | Sunderland (Maryland) | Calvert | US-MD | 410 | |
| 20690 | Tall Timbers (Maryland) | St. Mary | US-MD | 240 / 301 | |
| 20692 | Valley Lee (Maryland) | St. Mary | US-MD | 301 | |
| 20693 | Welcome (Maryland) | Charles | US-MD | 240 | |
| 20695 | White Plains (Maryland) | Charles | US-MD | 301 | |
| 20697 | Southern Md Facility (Maryland) | Prince Georges | US-MD | 240 | |
| 20701 | Annapolis Junction (Maryland) | Howard | US-MD | 410 / 443 | |
| 20703 | Lanham (Maryland) | Prince Georges | US-MD | 240 | |
| 20704 | Beltsville (Maryland) | Prince Georges | US-MD | 240 | |
| 20705 | Beltsville (Maryland) | Prince Georges | US-MD | 240 / 301 / 410 | |
| 20706 | Lanham (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20707 | Laurel (Maryland) | Prince Georges | US-MD | 240 / 301 / 410 / 443 | |
| 20708 | Laurel (Maryland) | Prince Georges | US-MD | 240 / 301 / 410 / 443 | |
| 20709 | Laurel (Maryland) | Prince Georges | US-MD | 240 | |
| 20710 | Bladensburg (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20711 | Lothian (Maryland) | Anne Arundel | US-MD | 240 / 301 | |
| 20712 | Mount Rainier (Maryland) | Prince Georges | US-MD | 301 / 240 | |
| 20714 | North Beach (Maryland) | Calvert | US-MD | 301 / 410 / 443 | |
| 20715 | Bowie (Maryland) | Prince Georges | US-MD | 301 / 240 | |
| 20716 | Bowie (Maryland) | Prince Georges | US-MD | 301 | |
| 20717 | Bowie (Maryland) | Prince Georges | US-MD | 240 | |
| 20718 | Bowie (Maryland) | Prince Georges | US-MD | 240 | |
| 20719 | Bowie (Maryland) | Prince Georges | US-MD | 240 | |
| 20720 | Bowie (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20721 | Bowie (Maryland) | Prince Georges | US-MD | 301 | |
| 20722 | Brentwood (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20723 | Laurel (Maryland) | Howard | US-MD | 240 / 301 / 410 / 443 | |
| 20724 | Laurel (Maryland) | Anne Arundel | US-MD | 240 / 301 / 410 / 443 | |
| 20725 | Laurel (Maryland) | Prince Georges | US-MD | 240 | |
| 20726 | Laurel (Maryland) | Prince Georges | US-MD | 240 | |
| 20731 | Capitol Heights (Maryland) | Prince Georges | US-MD | 240 | |
| 20732 | Chesapeake Beach (Maryland) | Calvert | US-MD | 410 | |
| 20733 | Churchton (Maryland) | Anne Arundel | US-MD | 410 | |
| 20735 | Clinton (Maryland) | Prince Georges | US-MD | 301 / 240 | |
| 20736 | Owings (Maryland) | Calvert | US-MD | 410 | |
| 20737 | Riverdale (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20738 | Riverdale (Maryland) | Prince Georges | US-MD | 240 | |
| 20740 | College Park (Maryland) | Prince Georges | US-MD | 301 / 240 | |
| 20741 | College Park (Maryland) | Prince Georges | US-MD | 240 | |
| 20742 | College Park (Maryland) | Prince Georges | US-MD | 240 | |
| 20743 | Capitol Heights (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20744 | Fort Washington (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20745 | Oxon Hill (Maryland) | Prince Georges | US-MD | 301 / 240 | |
| 20746 | Suitland (Maryland) | Prince Georges | US-MD | 301 / 240 | |
| 20747 | District Heights (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20748 | Temple Hills (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20749 | Fort Washington (Maryland) | Prince Georges | US-MD | 240 | |
| 20750 | Oxon Hill (Maryland) | Prince Georges | US-MD | 240 | |
| 20751 | Deale (Maryland) | Anne Arundel | US-MD | 410 | |
| 20752 | Suitland (Maryland) | Prince Georges | US-MD | 240 | |
| 20753 | District Heights (Maryland) | Prince Georges | US-MD | 240 | |
| 20755 | Fort George G Meade (Maryland) | Anne Arundel | US-MD | 410 | |
| 20757 | Temple Hills (Maryland) | Prince Georges | US-MD | 240 | |
| 20758 | Friendship (Maryland) | Anne Arundel | US-MD | 410 | |
| 20759 | Fulton (Maryland) | Howard | US-MD | 410 | |
| 20762 | Andrews Air Force Base (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20763 | Savage (Maryland) | Howard | US-MD | 410 / 443 | |
| 20764 | Shady Side (Maryland) | Anne Arundel | US-MD | 410 | |
| 20765 | Galesville (Maryland) | Anne Arundel | US-MD | 410 | |
| 20768 | Greenbelt (Maryland) | Prince Georges | US-MD | 240 | |
| 20769 | Glenn Dale (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20770 | Greenbelt (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20771 | Greenbelt (Maryland) | Prince Georges | US-MD | 240 | |
| 20772 | Upper Marlboro (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20773 | Upper Marlboro (Maryland) | Prince Georges | US-MD | 240 | |
| 20774 | Upper Marlboro (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20775 | Upper Marlboro (Maryland) | Prince Georges | US-MD | 240 | |
| 20776 | Harwood (Maryland) | Anne Arundel | US-MD | 410 | |
| 20777 | Highland (Maryland) | Howard | US-MD | 240 | |
| 20778 | West River (Maryland) | Anne Arundel | US-MD | 410 / 443 | |
| 20779 | Tracys Landing (Maryland) | Anne Arundel | US-MD | 410 | |
| 20781 | Hyattsville (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20782 | Hyattsville (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20783 | Hyattsville (Maryland) | Prince Georges | US-MD | 301 | |
| 20784 | Hyattsville (Maryland) | Prince Georges | US-MD | 301 | |
| 20785 | Hyattsville (Maryland) | Prince Georges | US-MD | 240 / 301 | |
| 20787 | Hyattsville (Maryland) | Prince Georges | US-MD | 240 | |
| 20788 | Hyattsville (Maryland) | Prince Georges | US-MD | 240 | |
| 20790 | Capitol Heights (Maryland) | Prince Georges | US-MD | 240 | |
| 20791 | Capitol Heights (Maryland) | Prince Georges | US-MD | 240 | |
| 20792 | Upper Marlboro (Maryland) | Prince Georges | US-MD | 240 | |
| 20794 | Jessup (Maryland) | Howard | US-MD | 410 / 443 | |
| 20797 | Southern Md Facility (Maryland) | Prince Georges | US-MD | 240 | |
| 20799 | Capitol Heights (Maryland) | Prince Georges | US-MD | 240 | |
| 20810 | Bethesda (Maryland) | Montgomery | US-MD | 240 | |
| 20811 | Bethesda (Maryland) | Montgomery | US-MD | 240 | |
| 20812 | Glen Echo (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20813 | Bethesda (Maryland) | Montgomery | US-MD | 240 | |
| 20814 | Bethesda (Maryland) | Montgomery | US-MD | 301 / 240 | |
| 20815 | Chevy Chase (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20816 | Bethesda (Maryland) | Montgomery | US-MD | 301 / 240 | |
| 20817 | Bethesda (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20818 | Cabin John (Maryland) | Montgomery | US-MD | 301 / 240 | |
| 20824 | Bethesda (Maryland) | Montgomery | US-MD | 240 | |
| 20825 | Chevy Chase (Maryland) | Montgomery | US-MD | 240 | |
| 20827 | Bethesda (Maryland) | Montgomery | US-MD | 240 | |
| 20830 | Olney (Maryland) | Montgomery | US-MD | 240 | |
| 20832 | Olney (Maryland) | Montgomery | US-MD | 240 | |
| 20837 | Poolesville (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20838 | Barnesville (Maryland) | Montgomery | US-MD | 240 | |
| 20839 | Beallsville (Maryland) | Montgomery | US-MD | 240 | |
| 20841 | Boyds (Maryland) | Montgomery | US-MD | 240 | |
| 20847 | Rockville (Maryland) | Montgomery | US-MD | 240 | |
| 20848 | Rockville (Maryland) | Montgomery | US-MD | 240 | |
| 20849 | Rockville (Maryland) | Montgomery | US-MD | 240 | |
| 20850 | Rockville (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20851 | Rockville (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20852 | Rockville (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20853 | Rockville (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20854 | Potomac (Maryland) | Montgomery | US-MD | 301 | |
| 20855 | Derwood (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20857 | Rockville (Maryland) | Montgomery | US-MD | 240 | |
| 20859 | Potomac (Maryland) | Montgomery | US-MD | 240 | |
| 20860 | Sandy Spring (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20861 | Ashton (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20862 | Brinklow (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20866 | Burtonsville (Maryland) | Montgomery | US-MD | 301 | |
| 20868 | Spencerville (Maryland) | Montgomery | US-MD | 301 | |
| 20871 | Clarksburg (Maryland) | Montgomery | US-MD | 301 / 240 | |
| 20872 | Damascus (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20874 | Germantown (Maryland) | Montgomery | US-MD | 240 | |
| 20875 | Germantown (Maryland) | Montgomery | US-MD | 240 | |
| 20876 | Germantown (Maryland) | Montgomery | US-MD | 240 | |
| 20877 | Gaithersburg (Maryland) | Montgomery | US-MD | 301 / 240 | |
| 20878 | Gaithersburg (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20879 | Gaithersburg (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20880 | Washington Grove (Maryland) | Montgomery | US-MD | 240 | |
| 20882 | Gaithersburg (Maryland) | Montgomery | US-MD | 240 | |
| 20883 | Gaithersburg (Maryland) | Montgomery | US-MD | 240 | |
| 20884 | Gaithersburg (Maryland) | Montgomery | US-MD | 240 | |
| 20885 | Gaithersburg (Maryland) | Montgomery | US-MD | 240 | |
| 20886 | Montgomery Village (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20889 | Bethesda (Maryland) | Montgomery | US-MD | 240 | |
| 20891 | Kensington (Maryland) | Montgomery | US-MD | 240 | |
| 20892 | Bethesda (Maryland) | Montgomery | US-MD | 240 | |
| 20894 | Bethesda (Maryland) | Montgomery | US-MD | 240 | |
| 20895 | Kensington (Maryland) | Montgomery | US-MD | 301 / 240 | |
| 20896 | Garrett Park (Maryland) | Montgomery | US-MD | 240 | |
| 20897 | Suburb Maryland Fac (Maryland) | Montgomery | US-MD | 240 | |
| 20898 | Gaithersburg (Maryland) | Montgomery | US-MD | 240 | |
| 20899 | Gaithersburg (Maryland) | Montgomery | US-MD | 240 | |
| 20901 | Silver Spring (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20902 | Silver Spring (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20903 | Silver Spring (Maryland) | Montgomery | US-MD | 301 | |
| 20904 | Silver Spring (Maryland) | Montgomery | US-MD | 301 | |
| 20905 | Silver Spring (Maryland) | Montgomery | US-MD | 301 | |
| 20906 | Silver Spring (Maryland) | Montgomery | US-MD | 301 / 240 | |
| 20907 | Silver Spring (Maryland) | Montgomery | US-MD | 240 | |
| 20908 | Silver Spring (Maryland) | Montgomery | US-MD | 240 | |
| 20910 | Silver Spring (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20911 | Silver Spring (Maryland) | Montgomery | US-MD | 240 | |
| 20912 | Takoma Park (Maryland) | Montgomery | US-MD | 240 / 301 | |
| 20913 | Takoma Park (Maryland) | Montgomery | US-MD | 240 | |
| 20914 | Silver Spring (Maryland) | Montgomery | US-MD | 240 | |
| 20915 | Silver Spring (Maryland) | Montgomery | US-MD | 240 | |
| 20916 | Silver Spring (Maryland) | Montgomery | US-MD | 240 | |
| 20918 | Silver Spring (Maryland) | Montgomery | US-MD | 240 | |
| 20993 | Silver Spring (Maryland) | Montgomery | US-MD | 240 | |
| 20997 | Silver Spring (Maryland) | Montgomery | US-MD | 240 | |
| 21001 | Aberdeen (Maryland) | Harford | US-MD | 410 / 443 / 667 | |
| 21005 | Aberdeen Proving Ground (Maryland) | Harford | US-MD | 443 / 667 | |
| 21009 | Abingdon (Maryland) | Harford | US-MD | 410 | |
| 21010 | Gunpowder (Maryland) | Harford | US-MD | 410 | |
| 21012 | Arnold (Maryland) | Anne Arundel | US-MD | 410 | |
| 21014 | Bel Air (Maryland) | Harford | US-MD | 410 / 443 | |
| 21015 | Bel Air (Maryland) | Harford | US-MD | 410 / 443 | |
| 21017 | Belcamp (Maryland) | Harford | US-MD | 410 | |
| 21018 | Benson (Maryland) | Harford | US-MD | 410 | |
| 21020 | Boring (Maryland) | Baltimore | US-MD | 410 | |
| 21022 | Brooklandville (Maryland) | Baltimore | US-MD | 410 | |
| 21023 | Butler (Maryland) | Baltimore | US-MD | 410 | |
| 21027 | Chase (Maryland) | Baltimore | US-MD | 410 | |
| 21028 | Churchville (Maryland) | Harford | US-MD | 410 / 443 | |
| 21029 | Clarksville (Maryland) | Howard | US-MD | 240 | |
| 21030 | Cockeysville (Maryland) | Baltimore | US-MD | 410 / 443 | |
| 21031 | Hunt Valley (Maryland) | Baltimore | US-MD | 443 / 410 | |
| 21032 | Crownsville (Maryland) | Anne Arundel | US-MD | 410 | |
| 21034 | Darlington (Maryland) | Harford | US-MD | 410 / 443 | |
| 21035 | Davidsonville (Maryland) | Anne Arundel | US-MD | 410 | |
| 21036 | Dayton (Maryland) | Howard | US-MD | 240 | |
| 21037 | Edgewater (Maryland) | Anne Arundel | US-MD | 301 / 410 | |
| 21040 | Edgewood (Maryland) | Harford | US-MD | 410 / 443 | |
| 21041 | Ellicott City (Maryland) | Howard | US-MD | 410 | |
| 21042 | Ellicott City (Maryland) | Howard | US-MD | 410 / 443 | |
| 21043 | Ellicott City (Maryland) | Howard | US-MD | 410 / 443 | |
| 21044 | Columbia (Maryland) | Howard | US-MD | 240 / 301 / 410 / 443 | |
| 21045 | Columbia (Maryland) | Howard | US-MD | 240 / 301 / 410 / 443 | |
| 21046 | Columbia (Maryland) | Howard | US-MD | 301 / 410 / 443 / 240 | |
| 21047 | Fallston (Maryland) | Harford | US-MD | 410 / 443 | |
| 21048 | Finksburg (Maryland) | Carroll | US-MD | 443 | |
| 21050 | Forest Hill (Maryland) | Harford | US-MD | 410 | |
| 21051 | Fork (Maryland) | Baltimore | US-MD | 410 / 443 | |
| 21052 | Fort Howard (Maryland) | Baltimore | US-MD | 410 | |
| 21053 | Freeland (Maryland) | Baltimore | US-MD | 410 | |
| 21054 | Gambrills (Maryland) | Anne Arundel | US-MD | 240 | |
| 21056 | Gibson Island (Maryland) | Anne Arundel | US-MD | 410 | |
| 21057 | Glen Arm (Maryland) | Baltimore | US-MD | 410 | |
| 21060 | Glen Burnie (Maryland) | Anne Arundel | US-MD | 443 / 410 | |
| 21061 | Glen Burnie (Maryland) | Anne Arundel | US-MD | 410 / 443 | |
| 21062 | Glen Burnie (Maryland) | Anne Arundel | US-MD | 410 | |
| 21065 | Hunt Valley (Maryland) | Baltimore | US-MD | 410 | |
| 21071 | Glyndon (Maryland) | Baltimore | US-MD | 410 / 443 | |
| 21074 | Hampstead (Maryland) | Carroll | US-MD | 410 / 443 | |
| 21075 | Elkridge (Maryland) | Howard | US-MD | 240 / 443 / 410 | |
| 21076 | Hanover (Maryland) | Anne Arundel | US-MD | 443 | |
| 21077 | Harmans (Maryland) | Anne Arundel | US-MD | 443 | |
| 21078 | Havre De Grace (Maryland) | Harford | US-MD | 667 / 410 / 443 | |
| 21082 | Hydes (Maryland) | Baltimore | US-MD | 410 | |
| 21084 | Jarrettsville (Maryland) | Harford | US-MD | 410 / 443 | |
| 21085 | Joppa (Maryland) | Harford | US-MD | 443 | |
| 21088 | Lineboro (Maryland) | Carroll | US-MD | 410 | |
| 21090 | Linthicum Heights (Maryland) | Anne Arundel | US-MD | 443 / 410 | |
| 21092 | Long Green (Maryland) | Baltimore | US-MD | 410 | |
| 21093 | Lutherville Timonium (Maryland) | Baltimore | US-MD | 410 | |
| 21094 | Lutherville Timonium (Maryland) | Baltimore | US-MD | 410 | |
| 21098 | Hanover (Maryland) | Anne Arundel | US-MD | 410 | |
| 21102 | Manchester (Maryland) | Carroll | US-MD | 410 / 443 | |
| 21105 | Maryland Line (Maryland) | Baltimore | US-MD | 410 | |
| 21106 | Mayo (Maryland) | Anne Arundel | US-MD | 410 | |
| 21108 | Millersville (Maryland) | Anne Arundel | US-MD | 410 / 443 | |
| 21113 | Odenton (Maryland) | Anne Arundel | US-MD | 240 / 301 / 410 / 443 | |
| 21114 | Crofton (Maryland) | Anne Arundel | US-MD | 240 / 410 / 443 / 667 | |
| 21117 | Owings Mills (Maryland) | Baltimore | US-MD | 410 | |
| 21120 | Parkton (Maryland) | Baltimore | US-MD | 410 / 443 | |
| 21122 | Pasadena (Maryland) | Anne Arundel | US-MD | 410 / 443 | |
| 21123 | Pasadena (Maryland) | Anne Arundel | US-MD | 410 | |
| 21128 | Perry Hall (Maryland) | Baltimore | US-MD | 410 | |
| 21130 | Perryman (Maryland) | Harford | US-MD | 410 | |
| 21131 | Phoenix (Maryland) | Baltimore | US-MD | 410 | |
| 21132 | Pylesville (Maryland) | Harford | US-MD | 410 | |
| 21133 | Randallstown (Maryland) | Baltimore | US-MD | 410 / 443 | |
| 21136 | Reisterstown (Maryland) | Baltimore | US-MD | 410 / 443 | |
| 21139 | Riderwood (Maryland) | Baltimore | US-MD | 410 | |
| 21140 | Riva (Maryland) | Anne Arundel | US-MD | 301 / 410 | |
| 21144 | Severn (Maryland) | Anne Arundel | US-MD | 410 / 443 | |
| 21146 | Severna Park (Maryland) | Anne Arundel | US-MD | 410 / 443 | |
| 21150 | Simpsonville (Maryland) | Howard | US-MD | 410 | |
| 21152 | Sparks Glencoe (Maryland) | Baltimore | US-MD | 410 / 443 | |
| 21153 | Stevenson (Maryland) | Baltimore | US-MD | 410 | |
| 21154 | Street (Maryland) | Harford | US-MD | 410 | |
| 21156 | Upper Falls (Maryland) | Baltimore | US-MD | 410 | |
| 21157 | Westminster (Maryland) | Carroll | US-MD | 410 / 443 | |
| 21158 | Westminster (Maryland) | Carroll | US-MD | 410 / 443 | |
| 21160 | Whiteford (Maryland) | Harford | US-MD | 410 / 443 | |
| 21162 | White Marsh (Maryland) | Baltimore | US-MD | 443 / 410 | |
| 21201 | Baltimore (Maryland) | Baltimore city | US-MD | 410 / 443 / 667 / 301 | |
| 21202 | Baltimore (Maryland) | Baltimore city | US-MD | 301 / 443 / 410 / 667 | |
| 21203 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21204 | Towson (Maryland) | Baltimore | US-MD | 410 / 443 / 667 | |
| 21205 | Baltimore (Maryland) | Baltimore city | US-MD | 410 / 443 | |
| 21206 | Baltimore (Maryland) | Baltimore city | US-MD | 410 / 443 | |
| 21207 | Gwynn Oak (Maryland) | Baltimore | US-MD | 667 / 410 / 443 | |
| 21208 | Pikesville (Maryland) | Baltimore | US-MD | 410 / 443 / 667 | |
| 21209 | Baltimore (Maryland) | Baltimore | US-MD | 410 | |
| 21210 | Baltimore (Maryland) | Baltimore city | US-MD | 443 / 410 | |
| 21211 | Baltimore (Maryland) | Baltimore city | US-MD | 410 / 443 | |
| 21212 | Baltimore (Maryland) | Baltimore city | US-MD | 410 / 443 / 667 | |
| 21213 | Baltimore (Maryland) | Baltimore city | US-MD | 410 / 443 | |
| 21214 | Baltimore (Maryland) | Baltimore city | US-MD | 443 / 410 | |
| 21215 | Baltimore (Maryland) | Baltimore city | US-MD | 410 | |
| 21216 | Baltimore (Maryland) | Baltimore city | US-MD | 410 | |
| 21217 | Baltimore (Maryland) | Baltimore city | US-MD | 410 / 443 | |
| 21218 | Baltimore (Maryland) | Baltimore city | US-MD | 443 / 410 | |
| 21219 | Sparrows Point (Maryland) | Baltimore | US-MD | 410 / 443 | |
| 21220 | Middle River (Maryland) | Baltimore | US-MD | 410 / 443 | |
| 21221 | Essex (Maryland) | Baltimore | US-MD | 410 / 443 | |
| 21222 | Dundalk (Maryland) | Baltimore | US-MD | 410 / 443 | |
| 21223 | Baltimore (Maryland) | Baltimore city | US-MD | 667 / 410 | |
| 21224 | Baltimore (Maryland) | Baltimore city | US-MD | 410 | |
| 21225 | Brooklyn (Maryland) | Baltimore city | US-MD | 410 / 443 | |
| 21226 | Curtis Bay (Maryland) | Anne Arundel | US-MD | 410 / 443 | |
| 21227 | Halethorpe (Maryland) | Baltimore | US-MD | 240 / 443 / 410 | |
| 21228 | Catonsville (Maryland) | Baltimore | US-MD | 410 / 443 | |
| 21229 | Baltimore (Maryland) | Baltimore city | US-MD | 410 | |
| 21230 | Baltimore (Maryland) | Baltimore city | US-MD | 410 / 667 | |
| 21231 | Baltimore (Maryland) | Baltimore city | US-MD | 410 / 443 / 667 | |
| 21233 | Baltimore (Maryland) | Baltimore City | US-MD | 410 / 667 / 301 / 443 | |
| 21234 | Parkville (Maryland) | Baltimore | US-MD | 410 / 443 | |
| 21235 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21236 | Nottingham (Maryland) | Baltimore | US-MD | 410 | |
| 21237 | Rosedale (Maryland) | Baltimore | US-MD | 410 | |
| 21239 | Baltimore (Maryland) | Baltimore city | US-MD | 443 / 410 | |
| 21240 | Baltimore (Maryland) | Anne Arundel | US-MD | 240 / 410 / 443 | |
| 21241 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21244 | Windsor Mill (Maryland) | Baltimore | US-MD | 410 | |
| 21250 | Baltimore (Maryland) | Baltimore | US-MD | 410 | |
| 21251 | Baltimore (Maryland) | Baltimore city | US-MD | 410 | |
| 21252 | Towson (Maryland) | Baltimore | US-MD | 410 | |
| 21260 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21261 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21263 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21264 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21265 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21268 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21270 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21273 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21274 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21275 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21278 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21279 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21280 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21281 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21282 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21283 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21284 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21285 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21286 | Towson (Maryland) | Baltimore | US-MD | 667 / 410 / 443 | |
| 21287 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21288 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21289 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21290 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21297 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21298 | Baltimore (Maryland) | Baltimore City | US-MD | 410 | |
| 21401 | Annapolis (Maryland) | Anne Arundel | US-MD | 410 / 443 / 301 | |
| 21402 | Annapolis (Maryland) | Anne Arundel | US-MD | 410 / 443 | |
| 21403 | Annapolis (Maryland) | Anne Arundel | US-MD | 301 / 410 / 443 | |
| 21404 | Annapolis (Maryland) | Anne Arundel | US-MD | 410 | |
| 21405 | Annapolis (Maryland) | Anne Arundel | US-MD | 301 / 410 / 443 | |
| 21409 | Annapolis (Maryland) | Anne Arundel | US-MD | 443 | |
| 21411 | Annapolis (Maryland) | Anne Arundel | US-MD | 410 | |
| 21412 | Annapolis (Maryland) | Anne Arundel | US-MD | 410 | |
| 21501 | Cumberland (Maryland) | Allegany | US-MD | 240 | |
| 21502 | Cumberland (Maryland) | Allegany | US-MD | 240 / 301 | |
| 21503 | Cumberland (Maryland) | Allegany | US-MD | 240 | |
| 21504 | Cumberland (Maryland) | Allegany | US-MD | 240 | |
| 21505 | Cumberland (Maryland) | Allegany | US-MD | 240 | |
| 21520 | Accident (Maryland) | Garrett | US-MD | 301 | |
| 21522 | Bittinger (Maryland) | Garrett | US-MD | 301 | |
| 21523 | Bloomington (Maryland) | Garrett | US-MD | 240 | |
| 21524 | Corriganville (Maryland) | Allegany | US-MD | 240 | |
| 21528 | Eckhart Mines (Maryland) | Allegany | US-MD | 240 | |
| 21529 | Ellerslie (Maryland) | Allegany | US-MD | 240 | |
| 21530 | Flintstone (Maryland) | Allegany | US-MD | 240 | |
| 21531 | Friendsville (Maryland) | Garrett | US-MD | 301 | |
| 21532 | Frostburg (Maryland) | Allegany | US-MD | 240 / 301 | |
| 21536 | Grantsville (Maryland) | Garrett | US-MD | 240 / 301 | |
| 21538 | Kitzmiller (Maryland) | Garrett | US-MD | 301 | |
| 21539 | Lonaconing (Maryland) | Allegany | US-MD | 301 | |
| 21540 | Luke (Maryland) | Allegany | US-MD | 301 | |
| 21541 | Mc Henry (Maryland) | Garrett | US-MD | 301 | |
| 21542 | Midland (Maryland) | Allegany | US-MD | 240 | |
| 21543 | Midlothian (Maryland) | Allegany | US-MD | 240 | |
| 21545 | Mount Savage (Maryland) | Allegany | US-MD | 301 | |
| 21550 | Oakland (Maryland) | Garrett | US-MD | 240 / 301 | |
| 21555 | Oldtown (Maryland) | Allegany | US-MD | 301 | |
| 21556 | Pinto (Maryland) | Allegany | US-MD | 240 | |
| 21557 | Rawlings (Maryland) | Allegany | US-MD | 240 | |
| 21560 | Spring Gap (Maryland) | Mineral | US-MD | 240 | |
| 21561 | Swanton (Maryland) | Garrett | US-MD | 301 | |
| 21562 | Westernport (Maryland) | Allegany | US-MD | 301 / 240 | |
| 21601 | Easton (Maryland) | Talbot | US-MD | 410 / 443 | |
| 21606 | Easton (Maryland) | Talbot | US-MD | 410 | |
| 21607 | Barclay (Maryland) | Queen Anne | US-MD | 410 | |
| 21609 | Bethlehem (Maryland) | Caroline | US-MD | 410 | |
| 21610 | Betterton (Maryland) | Kent | US-MD | 410 | |
| 21612 | Bozman (Maryland) | Talbot | US-MD | 410 | |
| 21613 | Cambridge (Maryland) | Dorchester | US-MD | 410 / 443 | |
| 21617 | Centreville (Maryland) | Queen Anne | US-MD | 410 / 443 | |
| 21619 | Chester (Maryland) | Queen Anne | US-MD | 410 | |
| 21620 | Chestertown (Maryland) | Kent | US-MD | 410 / 443 | |
| 21622 | Church Creek (Maryland) | Dorchester | US-MD | 410 | |
| 21623 | Church Hill (Maryland) | Queen Anne | US-MD | 410 | |
| 21624 | Claiborne (Maryland) | Talbot | US-MD | 410 | |
| 21625 | Cordova (Maryland) | Talbot | US-MD | 410 | |
| 21626 | Crapo (Maryland) | Dorchester | US-MD | 410 | |
| 21627 | Crocheron (Maryland) | Dorchester | US-MD | 410 | |
| 21628 | Crumpton (Maryland) | Queen Anne | US-MD | 410 | |
| 21629 | Denton (Maryland) | Caroline | US-MD | 410 / 443 | |
| 21631 | East New Market (Maryland) | Dorchester | US-MD | 410 | |
| 21632 | Federalsburg (Maryland) | Caroline | US-MD | 410 / 443 | |
| 21634 | Fishing Creek (Maryland) | Dorchester | US-MD | 410 | |
| 21635 | Galena (Maryland) | Kent | US-MD | 410 | |
| 21636 | Goldsboro (Maryland) | Caroline | US-MD | 410 | |
| 21638 | Grasonville (Maryland) | Queen Anne | US-MD | 410 | |
| 21639 | Greensboro (Maryland) | Caroline | US-MD | 410 | |
| 21640 | Henderson (Maryland) | Caroline | US-MD | 410 | |
| 21641 | Hillsboro (Maryland) | Caroline | US-MD | 410 | |
| 21643 | Hurlock (Maryland) | Dorchester | US-MD | 410 | |
| 21644 | Ingleside (Maryland) | Queen Anne | US-MD | 410 | |
| 21645 | Kennedyville (Maryland) | Kent | US-MD | 410 | |
| 21647 | Mcdaniel (Maryland) | Talbot | US-MD | 410 | |
| 21648 | Madison (Maryland) | Dorchester | US-MD | 410 | |
| 21649 | Marydel (Maryland) | Caroline | US-MD | 410 | |
| 21650 | Massey (Maryland) | Kent | US-MD | 410 | |
| 21651 | Millington (Maryland) | Kent | US-MD | 410 | |
| 21652 | Neavitt (Maryland) | Talbot | US-MD | 410 | |
| 21653 | Newcomb (Maryland) | Talbot | US-MD | 410 | |
| 21654 | Oxford (Maryland) | Talbot | US-MD | 410 | |
| 21655 | Preston (Maryland) | Caroline | US-MD | 410 | |
| 21656 | Price (Maryland) | Queen Anne | US-MD | 410 | |
| 21657 | Queen Anne (Maryland) | Queen Anne | US-MD | 410 | |
| 21658 | Queenstown (Maryland) | Queen Anne | US-MD | 410 / 443 | |
| 21659 | Rhodesdale (Maryland) | Dorchester | US-MD | 410 / 443 | |
| 21660 | Ridgely (Maryland) | Caroline | US-MD | 410 | |
| 21661 | Rock Hall (Maryland) | Kent | US-MD | 410 | |
| 21662 | Royal Oak (Maryland) | Talbot | US-MD | 410 | |
| 21663 | Saint Michaels (Maryland) | Talbot | US-MD | 410 | |
| 21664 | Secretary (Maryland) | Dorchester | US-MD | 410 | |
| 21665 | Sherwood (Maryland) | Talbot | US-MD | 410 | |
| 21666 | Stevensville (Maryland) | Queen Anne | US-MD | 410 / 443 | |
| 21667 | Still Pond (Maryland) | Kent | US-MD | 410 | |
| 21668 | Sudlersville (Maryland) | Queen Anne | US-MD | 410 | |
| 21669 | Taylors Island (Maryland) | Dorchester | US-MD | 410 | |
| 21670 | Templeville (Maryland) | Caroline | US-MD | 410 | |
| 21671 | Tilghman (Maryland) | Talbot | US-MD | 410 | |
| 21672 | Toddville (Maryland) | Dorchester | US-MD | 410 | |
| 21673 | Trappe (Maryland) | Talbot | US-MD | 410 / 443 | |
| 21675 | Wingate (Maryland) | Dorchester | US-MD | 410 | |
| 21676 | Wittman (Maryland) | Talbot | US-MD | 410 | |
| 21677 | Woolford (Maryland) | Dorchester | US-MD | 410 | |
| 21678 | Worton (Maryland) | Kent | US-MD | 410 | |
| 21679 | Wye Mills (Maryland) | Talbot | US-MD | 410 | |
| 21681 | Ridgely (Maryland) | Caroline | US-MD | 410 | |
| 21682 | Ridgely (Maryland) | Caroline | US-MD | 410 | |
| 21683 | Ridgely (Maryland) | Caroline | US-MD | 410 | |
| 21684 | Ridgely (Maryland) | Caroline | US-MD | 410 | |
| 21685 | Ridgely (Maryland) | Caroline | US-MD | 410 | |
| 21686 | Ridgely (Maryland) | Caroline | US-MD | 410 | |
| 21687 | Ridgely (Maryland) | Caroline | US-MD | 410 | |
| 21688 | Ridgely (Maryland) | Caroline | US-MD | 410 | |
| 21690 | Chestertown (Maryland) | Kent | US-MD | 410 | |
| 21701 | Frederick (Maryland) | Frederick | US-MD | 240 / 301 | |
| 21702 | Frederick (Maryland) | Frederick | US-MD | 240 / 301 | |
| 21703 | Frederick (Maryland) | Frederick | US-MD | 301 / 240 | |
| 21704 | Frederick (Maryland) | Frederick | US-MD | 301 / 240 | |
| 21705 | Frederick (Maryland) | Frederick | US-MD | 240 | |
| 21709 | Frederick (Maryland) | Frederick | US-MD | 240 | |
| 21710 | Adamstown (Maryland) | Frederick | US-MD | 240 / 301 | |
| 21711 | Big Pool (Maryland) | Washington | US-MD | 240 | |
| 21713 | Boonsboro (Maryland) | Washington | US-MD | 240 | |
| 21714 | Braddock Heights (Maryland) | Frederick | US-MD | 240 | |
| 21715 | Brownsville (Maryland) | Washington | US-MD | 240 | |
| 21716 | Brunswick (Maryland) | Frederick | US-MD | 301 | |
| 21717 | Buckeystown (Maryland) | Frederick | US-MD | 240 | |
| 21718 | Burkittsville (Maryland) | Frederick | US-MD | 240 | |
| 21719 | Cascade (Maryland) | Washington | US-MD | 240 / 301 | |
| 21720 | Cavetown (Maryland) | Washington | US-MD | 240 | |
| 21721 | Chewsville (Maryland) | Washington | US-MD | 240 | |
| 21722 | Clear Spring (Maryland) | Washington | US-MD | 301 | |
| 21723 | Cooksville (Maryland) | Howard | US-MD | 410 | |
| 21727 | Emmitsburg (Maryland) | Frederick | US-MD | 240 / 301 | |
| 21733 | Fairplay (Maryland) | Washington | US-MD | 240 | |
| 21734 | Funkstown (Maryland) | Washington | US-MD | 240 | |
| 21737 | Glenelg (Maryland) | Howard | US-MD | 410 | |
| 21738 | Glenwood (Maryland) | Howard | US-MD | 410 / 443 | |
| 21740 | Hagerstown (Maryland) | Washington | US-MD | 240 / 301 | |
| 21741 | Hagerstown (Maryland) | Washington | US-MD | 240 | |
| 21742 | Hagerstown (Maryland) | Washington | US-MD | 240 / 301 | |
| 21746 | Hagerstown (Maryland) | Washington | US-MD | 240 | |
| 21747 | Hagerstown (Maryland) | Washington | US-MD | 240 | |
| 21748 | Hagerstown (Maryland) | Washington | US-MD | 240 | |
| 21749 | Hagerstown (Maryland) | Washington | US-MD | 240 | |
| 21750 | Hancock (Maryland) | Washington | US-MD | 240 / 301 | |
| 21754 | Ijamsville (Maryland) | Frederick | US-MD | 240 | |
| 21755 | Jefferson (Maryland) | Frederick | US-MD | 240 | |
| 21756 | Keedysville (Maryland) | Washington | US-MD | 301 | |
| 21758 | Knoxville (Maryland) | Frederick | US-MD | 301 | |
| 21759 | Ladiesburg (Maryland) | Frederick | US-MD | 240 | |
| 21762 | Libertytown (Maryland) | Frederick | US-MD | 240 | |
| 21765 | Lisbon (Maryland) | Howard | US-MD | 410 | |
| 21766 | Little Orleans (Maryland) | Allegany | US-MD | 240 | |
| 21767 | Maugansville (Maryland) | Washington | US-MD | 240 | |
| 21769 | Middletown (Maryland) | Frederick | US-MD | 240 / 301 | |
| 21770 | Monrovia (Maryland) | Frederick | US-MD | 240 / 301 | |
| 21771 | Mount Airy (Maryland) | Frederick | US-MD | 240 / 301 | |
| 21773 | Myersville (Maryland) | Frederick | US-MD | 240 / 301 | |
| 21774 | New Market (Maryland) | Frederick | US-MD | 301 | |
| 21775 | New Midway (Maryland) | Frederick | US-MD | 240 | |
| 21776 | New Windsor (Maryland) | Carroll | US-MD | 410 / 443 | |
| 21777 | Point Of Rocks (Maryland) | Frederick | US-MD | 240 | |
| 21778 | Rocky Ridge (Maryland) | Frederick | US-MD | 240 | |
| 21779 | Rohrersville (Maryland) | Washington | US-MD | 240 | |
| 21780 | Sabillasville (Maryland) | Frederick | US-MD | 240 | |
| 21781 | Saint James (Maryland) | Washington | US-MD | 240 | |
| 21782 | Sharpsburg (Maryland) | Washington | US-MD | 240 | |
| 21783 | Smithsburg (Maryland) | Washington | US-MD | 240 / 301 | |
| 21784 | Sykesville (Maryland) | Carroll | US-MD | 410 / 443 | |
| 21787 | Taneytown (Maryland) | Carroll | US-MD | 410 / 443 | |
| 21788 | Thurmont (Maryland) | Frederick | US-MD | 240 / 301 | |
| 21790 | Tuscarora (Maryland) | Frederick | US-MD | 240 | |
| 21791 | Union Bridge (Maryland) | Carroll | US-MD | 410 / 443 | |
| 21792 | Unionville (Maryland) | Frederick | US-MD | 240 | |
| 21793 | Walkersville (Maryland) | Frederick | US-MD | 301 | |
| 21794 | West Friendship (Maryland) | Howard | US-MD | 410 | |
| 21795 | Williamsport (Maryland) | Washington | US-MD | 240 / 301 | |
| 21798 | Woodsboro (Maryland) | Frederick | US-MD | 240 | |
| 21801 | Salisbury (Maryland) | Wicomico | US-MD | 443 / 410 / 667 | |
| 21802 | Salisbury (Maryland) | Wicomico | US-MD | 410 | |
| 21803 | Salisbury (Maryland) | Wicomico | US-MD | 410 | |
| 21804 | Salisbury (Maryland) | Wicomico | US-MD | 410 / 667 / 443 | |
| 21810 | Allen (Maryland) | Wicomico | US-MD | 410 | |
| 21811 | Berlin (Maryland) | Worcester | US-MD | 410 / 443 | |
| 21813 | Bishopville (Maryland) | Worcester | US-MD | 410 / 443 | |
| 21814 | Bivalve (Maryland) | Wicomico | US-MD | 410 | |
| 21817 | Crisfield (Maryland) | Somerset | US-MD | 410 / 443 | |
| 21821 | Deal Island (Maryland) | Somerset | US-MD | 410 | |
| 21824 | Ewell (Maryland) | Somerset | US-MD | 410 | |
| 21826 | Fruitland (Maryland) | Wicomico | US-MD | 410 | |
| 21829 | Girdletree (Maryland) | Worcester | US-MD | 410 | |
| 21830 | Hebron (Maryland) | Wicomico | US-MD | 410 / 443 | |
| 21835 | Linkwood (Maryland) | Dorchester | US-MD | 410 / 443 | |
| 21836 | Manokin (Maryland) | Somerset | US-MD | 410 | |
| 21837 | Mardela Springs (Maryland) | Wicomico | US-MD | 410 / 443 | |
| 21838 | Marion Station (Maryland) | Somerset | US-MD | 410 | |
| 21840 | Nanticoke (Maryland) | Wicomico | US-MD | 410 / 443 | |
| 21841 | Newark (Maryland) | Worcester | US-MD | 410 | |
| 21842 | Ocean City (Maryland) | Worcester | US-MD | 410 / 443 | |
| 21843 | Ocean City (Maryland) | Worcester | US-MD | 410 | |
| 21849 | Parsonsburg (Maryland) | Wicomico | US-MD | 410 | |
| 21850 | Pittsville (Maryland) | Wicomico | US-MD | 410 | |
| 21851 | Pocomoke City (Maryland) | Worcester | US-MD | 410 / 443 | |
| 21852 | Powellville (Maryland) | Wicomico | US-MD | 410 | |
| 21853 | Princess Anne (Maryland) | Somerset | US-MD | 410 / 443 | |
| 21856 | Quantico (Maryland) | Wicomico | US-MD | 410 | |
| 21857 | Rehobeth (Maryland) | Somerset | US-MD | 410 | |
| 21861 | Sharptown (Maryland) | Wicomico | US-MD | 410 | |
| 21862 | Showell (Maryland) | Worcester | US-MD | 410 | |
| 21863 | Snow Hill (Maryland) | Worcester | US-MD | 410 / 443 | |
| 21864 | Stockton (Maryland) | Worcester | US-MD | 410 | |
| 21865 | Tyaskin (Maryland) | Wicomico | US-MD | 410 | |
| 21866 | Tylerton (Maryland) | Somerset | US-MD | 410 | |
| 21867 | Upper Fairmount (Maryland) | Somerset | US-MD | 410 | |
| 21869 | Vienna (Maryland) | Dorchester | US-MD | 410 | |
| 21871 | Westover (Maryland) | Somerset | US-MD | 410 | |
| 21872 | Whaleyville (Maryland) | Worcester | US-MD | 410 | |
| 21874 | Willards (Maryland) | Wicomico | US-MD | 410 / 443 | |
| 21875 | Delmar (Maryland) | Wicomico | US-MD | 410 / 443 | |
| 21890 | Westover (Maryland) | Somerset | US-MD | 410 | |
| 21901 | North East (Maryland) | Cecil | US-MD | 410 / 443 | |
| 21902 | Perry Point (Maryland) | Cecil | US-MD | 410 | |
| 21903 | Perryville (Maryland) | Cecil | US-MD | 410 / 443 | |
| 21904 | Port Deposit (Maryland) | Cecil | US-MD | 410 / 443 | |
| 21911 | Rising Sun (Maryland) | Cecil | US-MD | 410 | |
| 21912 | Warwick (Maryland) | Cecil | US-MD | 410 | |
| 21913 | Cecilton (Maryland) | Cecil | US-MD | 410 | |
| 21914 | Charlestown (Maryland) | Cecil | US-MD | 410 | |
| 21915 | Chesapeake City (Maryland) | Cecil | US-MD | 443 / 410 | |
| 21916 | Childs (Maryland) | Cecil | US-MD | 410 | |
| 21917 | Colora (Maryland) | Cecil | US-MD | 410 | |
| 21918 | Conowingo (Maryland) | Cecil | US-MD | 410 | |
| 21919 | Earleville (Maryland) | Cecil | US-MD | 410 | |
| 21920 | Elk Mills (Maryland) | Cecil | US-MD | 410 | |
| 21921 | Elkton (Maryland) | Cecil | US-MD | 410 / 443 | |
| 21922 | Elkton (Maryland) | Cecil | US-MD | 410 | |
| 21930 | Georgetown (Maryland) | Cecil | US-MD | 410 | |
| 20754 | Dunkirk (Maryland) | Calvert | US-MD | 301 / 410 | |
| 20833 | Brookeville (Maryland) | Montgomery | US-MD | 301 | |
| 20842 | Dickerson (Maryland) | Montgomery | US-MD | 301 | |
| 21013 | Baldwin (Maryland) | Baltimore | US-MD | 410 | |
| 21087 | Kingsville (Maryland) | Baltimore | US-MD | 410 / 443 | |
| 21104 | Marriottsville (Maryland) | Carroll | US-MD | 410 / 443 | |
| 21111 | Monkton (Maryland) | Baltimore | US-MD | 301 / 410 | |
| 21155 | Upperco (Maryland) | Baltimore | US-MD | 410 | |
| 21161 | White Hall (Maryland) | Harford | US-MD | 410 | |
| 21163 | Woodstock (Maryland) | Howard | US-MD | 410 | |
| 21521 | Barton (Maryland) | Allegany | US-MD | 301 | |
| 21757 | Keymar (Maryland) | Frederick | US-MD | 301 / 410 | |
| 21797 | Woodbine (Maryland) | Howard | US-MD | 301 / 410 | |
| 21822 | Eden (Maryland) | Somerset | US-MD | 410 / 443 | |
| 20588 | Dhs (Maryland) | Howard | US-MD | 301 | |
| 20601 | Waldorf (Maryland) | Charles | US-MD | 301 | |
| 20602 | Waldorf (Maryland) | Charles | US-MD | 301 | |
| 20603 | Waldorf (Maryland) | Charles | US-MD | 301 | |
| 20611 | Bel Alton (Maryland) | Charles | US-MD | 301 | |
| 20613 | Brandywine (Maryland) | Prince Georges | US-MD | 301 | |
| 20620 | Callaway (Maryland) | St. Mary | US-MD | 301 | |
| 20623 | Cheltenham (Maryland) | Prince Georges | US-MD | 301 | |
| 20634 | Great Mills (Maryland) | St. Mary | US-MD | 301 | |
| 20637 | Hughesville (Maryland) | Charles | US-MD | 301 | |
| 20639 | Huntingtown (Maryland) | Calvert | US-MD | 443 | |
| 20640 | Indian Head (Maryland) | Charles | US-MD | 301 | |
| 20645 | Issue (Maryland) | Charles | US-MD | 301 | |
| 20646 | La Plata (Maryland) | Charles | US-MD | 301 | |
| 20650 | Leonardtown (Maryland) | St. Mary | US-MD | 301 | |
| 20653 | Lexington Park (Maryland) | St. Mary | US-MD | 301 | |
| 20659 | Mechanicsville (Maryland) | St. Mary | US-MD | 301 | |
| 20662 | Nanjemoy (Maryland) | Charles | US-MD | 301 | |
| 20664 | Newburg (Maryland) | Charles | US-MD | 240 | |
| 20670 | Patuxent River (Maryland) | St. Mary | US-MD | 301 | |
| 20676 | Port Republic (Maryland) | Calvert | US-MD | 443 | |
| 20677 | Port Tobacco (Maryland) | Charles | US-MD | 301 | |
| 20678 | Prince Frederick (Maryland) | Calvert | US-MD | 443 | |
| 20680 | Ridge (Maryland) | St. Mary | US-MD | 301 | |
| 20688 | Solomons (Maryland) | Calvert | US-MD | 667 | |
| 20690 | Tall Timbers (Maryland) | St. Mary | US-MD | 301 | |
| 20701 | Annapolis Junction (Maryland) | Howard | US-MD | 443 | |
| 20705 | Beltsville (Maryland) | Prince Georges | US-MD | 410 | |
| 20706 | Lanham (Maryland) | Prince Georges | US-MD | 301 | |
| 20707 | Laurel (Maryland) | Prince Georges | US-MD | 443 | |
| 20708 | Laurel (Maryland) | Prince Georges | US-MD | 443 | |
| 20710 | Bladensburg (Maryland) | Prince Georges | US-MD | 301 | |
| 20711 | Lothian (Maryland) | Anne Arundel | US-MD | 301 | |
| 20712 | Mount Rainier (Maryland) | Prince Georges | US-MD | 240 | |
| 20714 | North Beach (Maryland) | Calvert | US-MD | 443 | |
| 20715 | Bowie (Maryland) | Prince Georges | US-MD | 240 | |
| 20720 | Bowie (Maryland) | Prince Georges | US-MD | 301 | |
| 20722 | Brentwood (Maryland) | Prince Georges | US-MD | 301 | |
| 20723 | Laurel (Maryland) | Howard | US-MD | 443 | |
| 20724 | Laurel (Maryland) | Anne Arundel | US-MD | 443 | |
| 20735 | Clinton (Maryland) | Prince Georges | US-MD | 240 | |
| 20737 | Riverdale (Maryland) | Prince Georges | US-MD | 301 | |
| 20740 | College Park (Maryland) | Prince Georges | US-MD | 240 | |
| 20743 | Capitol Heights (Maryland) | Prince Georges | US-MD | 301 | |
| 20744 | Fort Washington (Maryland) | Prince Georges | US-MD | 301 | |
| 20745 | Oxon Hill (Maryland) | Prince Georges | US-MD | 240 | |
| 20746 | Suitland (Maryland) | Prince Georges | US-MD | 240 | |
| 20747 | District Heights (Maryland) | Prince Georges | US-MD | 301 | |
| 20748 | Temple Hills (Maryland) | Prince Georges | US-MD | 301 | |
| 20762 | Andrews Air Force Base (Maryland) | Prince Georges | US-MD | 301 | |
| 20763 | Savage (Maryland) | Howard | US-MD | 443 | |
| 20769 | Glenn Dale (Maryland) | Prince Georges | US-MD | 301 | |
| 20770 | Greenbelt (Maryland) | Prince Georges | US-MD | 301 | |
| 20772 | Upper Marlboro (Maryland) | Prince Georges | US-MD | 301 | |
| 20774 | Upper Marlboro (Maryland) | Prince Georges | US-MD | 301 | |
| 20778 | West River (Maryland) | Anne Arundel | US-MD | 443 | |
| 20781 | Hyattsville (Maryland) | Prince Georges | US-MD | 301 | |
| 20782 | Hyattsville (Maryland) | Prince Georges | US-MD | 301 | |
| 20785 | Hyattsville (Maryland) | Prince Georges | US-MD | 301 | |
| 20794 | Jessup (Maryland) | Howard | US-MD | 443 | |
| 20812 | Glen Echo (Maryland) | Montgomery | US-MD | 301 | |
| 20814 | Bethesda (Maryland) | Montgomery | US-MD | 240 | |
| 20815 | Chevy Chase (Maryland) | Montgomery | US-MD | 301 | |
| 20816 | Bethesda (Maryland) | Montgomery | US-MD | 240 | |
| 20817 | Bethesda (Maryland) | Montgomery | US-MD | 301 | |
| 20818 | Cabin John (Maryland) | Montgomery | US-MD | 240 | |
| 20837 | Poolesville (Maryland) | Montgomery | US-MD | 301 | |
| 20850 | Rockville (Maryland) | Montgomery | US-MD | 301 | |
| 20851 | Rockville (Maryland) | Montgomery | US-MD | 301 | |
| 20852 | Rockville (Maryland) | Montgomery | US-MD | 301 | |
| 20853 | Rockville (Maryland) | Montgomery | US-MD | 301 | |
| 20855 | Derwood (Maryland) | Montgomery | US-MD | 301 | |
| 20860 | Sandy Spring (Maryland) | Montgomery | US-MD | 301 | |
| 20861 | Ashton (Maryland) | Montgomery | US-MD | 301 | |
| 20862 | Brinklow (Maryland) | Montgomery | US-MD | 301 | |
| 20871 | Clarksburg (Maryland) | Montgomery | US-MD | 240 | |
| 20872 | Damascus (Maryland) | Montgomery | US-MD | 301 | |
| 20877 | Gaithersburg (Maryland) | Montgomery | US-MD | 240 | |
| 20878 | Gaithersburg (Maryland) | Montgomery | US-MD | 301 | |
| 20879 | Gaithersburg (Maryland) | Montgomery | US-MD | 301 | |
| 20886 | Montgomery Village (Maryland) | Montgomery | US-MD | 301 | |
| 20895 | Kensington (Maryland) | Montgomery | US-MD | 240 | |
| 20901 | Silver Spring (Maryland) | Montgomery | US-MD | 301 | |
| 20902 | Silver Spring (Maryland) | Montgomery | US-MD | 301 | |
| 20906 | Silver Spring (Maryland) | Montgomery | US-MD | 240 | |
| 20910 | Silver Spring (Maryland) | Montgomery | US-MD | 301 | |
| 20912 | Takoma Park (Maryland) | Montgomery | US-MD | 301 | |
| 21001 | Aberdeen (Maryland) | Harford | US-MD | 667 | |
| 21005 | Aberdeen Proving Ground (Maryland) | Harford | US-MD | 667 | |
| 21014 | Bel Air (Maryland) | Harford | US-MD | 443 | |
| 21015 | Bel Air (Maryland) | Harford | US-MD | 443 | |
| 21028 | Churchville (Maryland) | Harford | US-MD | 443 | |
| 21030 | Cockeysville (Maryland) | Baltimore | US-MD | 443 | |
| 21031 | Hunt Valley (Maryland) | Baltimore | US-MD | 410 | |
| 21034 | Darlington (Maryland) | Harford | US-MD | 443 | |
| 21037 | Edgewater (Maryland) | Anne Arundel | US-MD | 410 | |
| 21040 | Edgewood (Maryland) | Harford | US-MD | 443 | |
| 21042 | Ellicott City (Maryland) | Howard | US-MD | 443 | |
| 21043 | Ellicott City (Maryland) | Howard | US-MD | 443 | |
| 21044 | Columbia (Maryland) | Howard | US-MD | 443 | |
| 21045 | Columbia (Maryland) | Howard | US-MD | 443 | |
| 21046 | Columbia (Maryland) | Howard | US-MD | 240 | |
| 21047 | Fallston (Maryland) | Harford | US-MD | 443 | |
| 21051 | Fork (Maryland) | Baltimore | US-MD | 443 | |
| 21060 | Glen Burnie (Maryland) | Anne Arundel | US-MD | 410 | |
| 21061 | Glen Burnie (Maryland) | Anne Arundel | US-MD | 443 | |
| 21071 | Glyndon (Maryland) | Baltimore | US-MD | 443 | |
| 21074 | Hampstead (Maryland) | Carroll | US-MD | 443 | |
| 21075 | Elkridge (Maryland) | Howard | US-MD | 410 | |
| 21078 | Havre De Grace (Maryland) | Harford | US-MD | 443 | |
| 21084 | Jarrettsville (Maryland) | Harford | US-MD | 443 | |
| 21090 | Linthicum Heights (Maryland) | Anne Arundel | US-MD | 410 | |
| 21102 | Manchester (Maryland) | Carroll | US-MD | 443 | |
| 21108 | Millersville (Maryland) | Anne Arundel | US-MD | 443 | |
| 21113 | Odenton (Maryland) | Anne Arundel | US-MD | 443 | |
| 21114 | Crofton (Maryland) | Anne Arundel | US-MD | 667 | |
| 21120 | Parkton (Maryland) | Baltimore | US-MD | 443 | |
| 21122 | Pasadena (Maryland) | Anne Arundel | US-MD | 443 | |
| 21133 | Randallstown (Maryland) | Baltimore | US-MD | 443 | |
| 21136 | Reisterstown (Maryland) | Baltimore | US-MD | 443 | |
| 21140 | Riva (Maryland) | Anne Arundel | US-MD | 410 | |
| 21144 | Severn (Maryland) | Anne Arundel | US-MD | 443 | |
| 21146 | Severna Park (Maryland) | Anne Arundel | US-MD | 443 | |
| 21152 | Sparks Glencoe (Maryland) | Baltimore | US-MD | 443 | |
| 21157 | Westminster (Maryland) | Carroll | US-MD | 443 | |
| 21158 | Westminster (Maryland) | Carroll | US-MD | 443 | |
| 21160 | Whiteford (Maryland) | Harford | US-MD | 443 | |
| 21162 | White Marsh (Maryland) | Baltimore | US-MD | 410 | |
| 21201 | Baltimore (Maryland) | Baltimore city | US-MD | 301 | |
| 21202 | Baltimore (Maryland) | Baltimore city | US-MD | 667 | |
| 21204 | Towson (Maryland) | Baltimore | US-MD | 667 | |
| 21205 | Baltimore (Maryland) | Baltimore city | US-MD | 443 | |
| 21206 | Baltimore (Maryland) | Baltimore city | US-MD | 443 | |
| 21207 | Gwynn Oak (Maryland) | Baltimore | US-MD | 443 | |
| 21208 | Pikesville (Maryland) | Baltimore | US-MD | 667 | |
| 21210 | Baltimore (Maryland) | Baltimore city | US-MD | 410 | |
| 21211 | Baltimore (Maryland) | Baltimore city | US-MD | 443 | |
| 21212 | Baltimore (Maryland) | Baltimore city | US-MD | 667 | |
| 21213 | Baltimore (Maryland) | Baltimore city | US-MD | 443 | |
| 21214 | Baltimore (Maryland) | Baltimore city | US-MD | 410 | |
| 21217 | Baltimore (Maryland) | Baltimore city | US-MD | 443 | |
| 21218 | Baltimore (Maryland) | Baltimore city | US-MD | 410 | |
| 21219 | Sparrows Point (Maryland) | Baltimore | US-MD | 443 | |
| 21220 | Middle River (Maryland) | Baltimore | US-MD | 443 | |
| 21221 | Essex (Maryland) | Baltimore | US-MD | 443 | |
| 21222 | Dundalk (Maryland) | Baltimore | US-MD | 443 | |
| 21223 | Baltimore (Maryland) | Baltimore city | US-MD | 410 | |
| 21225 | Brooklyn (Maryland) | Baltimore city | US-MD | 443 | |
| 21226 | Curtis Bay (Maryland) | Anne Arundel | US-MD | 443 | |
| 21227 | Halethorpe (Maryland) | Baltimore | US-MD | 410 | |
| 21228 | Catonsville (Maryland) | Baltimore | US-MD | 443 | |
| 21230 | Baltimore (Maryland) | Baltimore city | US-MD | 667 | |
| 21231 | Baltimore (Maryland) | Baltimore city | US-MD | 667 | |
| 21233 | Baltimore (Maryland) | Baltimore City | US-MD | 443 | |
| 21234 | Parkville (Maryland) | Baltimore | US-MD | 443 | |
| 21239 | Baltimore (Maryland) | Baltimore city | US-MD | 410 | |
| 21240 | Baltimore (Maryland) | Anne Arundel | US-MD | 443 | |
| 21286 | Towson (Maryland) | Baltimore | US-MD | 443 | |
| 21401 | Annapolis (Maryland) | Anne Arundel | US-MD | 301 | |
| 21402 | Annapolis (Maryland) | Anne Arundel | US-MD | 443 | |
| 21403 | Annapolis (Maryland) | Anne Arundel | US-MD | 443 | |
| 21405 | Annapolis (Maryland) | Anne Arundel | US-MD | 443 | |
| 21502 | Cumberland (Maryland) | Allegany | US-MD | 301 | |
| 21532 | Frostburg (Maryland) | Allegany | US-MD | 301 | |
| 21536 | Grantsville (Maryland) | Garrett | US-MD | 301 | |
| 21550 | Oakland (Maryland) | Garrett | US-MD | 301 | |
| 21562 | Westernport (Maryland) | Allegany | US-MD | 240 | |
| 21601 | Easton (Maryland) | Talbot | US-MD | 443 | |
| 21613 | Cambridge (Maryland) | Dorchester | US-MD | 443 | |
| 21617 | Centreville (Maryland) | Queen Anne | US-MD | 443 | |
| 21620 | Chestertown (Maryland) | Kent | US-MD | 443 | |
| 21629 | Denton (Maryland) | Caroline | US-MD | 443 | |
| 21632 | Federalsburg (Maryland) | Caroline | US-MD | 443 | |
| 21658 | Queenstown (Maryland) | Queen Anne | US-MD | 443 | |
| 21659 | Rhodesdale (Maryland) | Dorchester | US-MD | 443 | |
| 21666 | Stevensville (Maryland) | Queen Anne | US-MD | 443 | |
| 21673 | Trappe (Maryland) | Talbot | US-MD | 443 | |
| 21701 | Frederick (Maryland) | Frederick | US-MD | 301 | |
| 21702 | Frederick (Maryland) | Frederick | US-MD | 301 | |
| 21703 | Frederick (Maryland) | Frederick | US-MD | 240 | |
| 21704 | Frederick (Maryland) | Frederick | US-MD | 240 | |
| 21710 | Adamstown (Maryland) | Frederick | US-MD | 301 | |
| 21719 | Cascade (Maryland) | Washington | US-MD | 301 | |
| 21727 | Emmitsburg (Maryland) | Frederick | US-MD | 301 | |
| 21738 | Glenwood (Maryland) | Howard | US-MD | 443 | |
| 21740 | Hagerstown (Maryland) | Washington | US-MD | 301 | |
| 21742 | Hagerstown (Maryland) | Washington | US-MD | 301 | |
| 21750 | Hancock (Maryland) | Washington | US-MD | 301 | |
| 21769 | Middletown (Maryland) | Frederick | US-MD | 301 | |
| 21770 | Monrovia (Maryland) | Frederick | US-MD | 301 | |
| 21771 | Mount Airy (Maryland) | Frederick | US-MD | 301 | |
| 21773 | Myersville (Maryland) | Frederick | US-MD | 301 | |
| 21776 | New Windsor (Maryland) | Carroll | US-MD | 443 | |
| 21783 | Smithsburg (Maryland) | Washington | US-MD | 301 | |
| 21784 | Sykesville (Maryland) | Carroll | US-MD | 443 | |
| 21787 | Taneytown (Maryland) | Carroll | US-MD | 443 | |
| 21788 | Thurmont (Maryland) | Frederick | US-MD | 301 | |
| 21791 | Union Bridge (Maryland) | Carroll | US-MD | 443 | |
| 21795 | Williamsport (Maryland) | Washington | US-MD | 301 | |
| 21801 | Salisbury (Maryland) | Wicomico | US-MD | 667 | |
| 21804 | Salisbury (Maryland) | Wicomico | US-MD | 443 | |
| 21811 | Berlin (Maryland) | Worcester | US-MD | 443 | |
| 21813 | Bishopville (Maryland) | Worcester | US-MD | 443 | |
| 21817 | Crisfield (Maryland) | Somerset | US-MD | 443 | |
| 21830 | Hebron (Maryland) | Wicomico | US-MD | 443 | |
| 21835 | Linkwood (Maryland) | Dorchester | US-MD | 443 | |
| 21837 | Mardela Springs (Maryland) | Wicomico | US-MD | 443 | |
| 21840 | Nanticoke (Maryland) | Wicomico | US-MD | 443 | |
| 21842 | Ocean City (Maryland) | Worcester | US-MD | 443 | |
| 21851 | Pocomoke City (Maryland) | Worcester | US-MD | 443 | |
| 21853 | Princess Anne (Maryland) | Somerset | US-MD | 443 | |
| 21863 | Snow Hill (Maryland) | Worcester | US-MD | 443 | |
| 21874 | Willards (Maryland) | Wicomico | US-MD | 443 | |
| 21875 | Delmar (Maryland) | Wicomico | US-MD | 443 | |
| 21901 | North East (Maryland) | Cecil | US-MD | 443 | |
| 21903 | Perryville (Maryland) | Cecil | US-MD | 443 | |
| 21904 | Port Deposit (Maryland) | Cecil | US-MD | 443 | |
| 21915 | Chesapeake City (Maryland) | Cecil | US-MD | 410 | |
| 21921 | Elkton (Maryland) | Cecil | US-MD | 443 | |
| 20754 | Dunkirk (Maryland) | Calvert | US-MD | 410 | |
| 21087 | Kingsville (Maryland) | Baltimore | US-MD | 443 | |
| 21104 | Marriottsville (Maryland) | Carroll | US-MD | 443 | |
| 21111 | Monkton (Maryland) | Baltimore | US-MD | 410 | |
| 21757 | Keymar (Maryland) | Frederick | US-MD | 410 | |
| 21797 | Woodbine (Maryland) | Howard | US-MD | 410 | |
| 21822 | Eden (Maryland) | Somerset | US-MD | 443 | |
| 20705 | Beltsville (Maryland) | Prince Georges | US-MD | 410 | |
| 20707 | Laurel (Maryland) | Prince Georges | US-MD | 410 | |
| 20708 | Laurel (Maryland) | Prince Georges | US-MD | 410 | |
| 20723 | Laurel (Maryland) | Howard | US-MD | 410 | |
| 20724 | Laurel (Maryland) | Anne Arundel | US-MD | 410 | |
| 21044 | Columbia (Maryland) | Howard | US-MD | 410 | |
| 21045 | Columbia (Maryland) | Howard | US-MD | 410 | |
| 21113 | Odenton (Maryland) | Anne Arundel | US-MD | 410 | |
| 21240 | Baltimore (Maryland) | Anne Arundel | US-MD | 443 | |
| 21114 | Crofton (Maryland) | Anne Arundel | US-MD | 443 | |
| 21075 | Elkridge (Maryland) | Howard | US-MD | 410 | |
| 21227 | Halethorpe (Maryland) | Baltimore | US-MD | 410 | |
| 20714 | North Beach (Maryland) | Calvert | US-MD | 443 | |
| 21403 | Annapolis (Maryland) | Anne Arundel | US-MD | 443 | |
| 21405 | Annapolis (Maryland) | Anne Arundel | US-MD | 443 | |
| 21046 | Columbia (Maryland) | Howard | US-MD | 443 | |
| 21202 | Baltimore (Maryland) | Baltimore city | US-MD | 410 | |
| 21078 | Havre De Grace (Maryland) | Harford | US-MD | 443 | |
| 21207 | Gwynn Oak (Maryland) | Baltimore | US-MD | 443 | |
| 21286 | Towson (Maryland) | Baltimore | US-MD | 443 | |
| 20707 | Laurel (Maryland) | Prince Georges | US-MD | 443 | |
| 20708 | Laurel (Maryland) | Prince Georges | US-MD | 443 | |
| 20723 | Laurel (Maryland) | Howard | US-MD | 443 | |
| 20724 | Laurel (Maryland) | Anne Arundel | US-MD | 443 | |
| 21044 | Columbia (Maryland) | Howard | US-MD | 443 | |
| 21045 | Columbia (Maryland) | Howard | US-MD | 443 | |
| 21113 | Odenton (Maryland) | Anne Arundel | US-MD | 443 | |
| 21114 | Crofton (Maryland) | Anne Arundel | US-MD | 667 | |
| 21046 | Columbia (Maryland) | Howard | US-MD | 240 | |
| 21202 | Baltimore (Maryland) | Baltimore city | US-MD | 667 |