To faciltiate users, Canada is divided into regions known as Area Codes, corresponding to particular geographic telephone dialing areas.
An area code denotes the regional location of a phone number within Canada.
The Area Code table below shows an area codes each.

To call Canada from the U.S.:
Dial 1, the country code for Canada,
then the area code (3 digits)
and finally the phone number (7 digits).

How to call Canada from France:
00 - France exit code to dial first when calling international
1 - Canadian country code must be dialed next
00 + 1 + Area Code + Local Number - Overall dialing code format

Calling Canada from Canada :
Country Code 1
Calling Format 1 + 3 digital area/city code + 7 digital phone number

>>> See All Canada Area Codes