- 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. - 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.
- 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.
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