US Area Code Info Center

An area code is the first three digits of a US or Canadian phone number, identifying a specific geographic region. Each area code covers one or more cities.

When demand exceeds an existing area code's capacity, a new overlay area code is introduced covering the same region.

An overlay is an additional area code added to the same geographic region. New numbers use the new code while existing numbers remain unchanged.

Yes, on GreatNumber you can search and purchase numbers by area code, choosing your preferred one.

10-digit dialing requires dialing the full 10-digit number (area code + 7-digit number) for local calls. Most regions already require 10-digit dialing.