- All Area Codes
Directory of U.S. area codes by state plus cities within each area code. Also lists Canadian area codes by province or territory.
www.allareacodes.com
- Canadian Numbering Administrator (CNA)
Provides number administration service for Canadian telecommunications, central office code administration, area codes, and the processing of applications for North American Numbering Plan resources.
www.cnac.ca
- Fone Finder
Identifies the city associated with a specific area code and prefix. Also identifies international country codes and the geographical location of the telephone.
www.fonefinder.net
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