LincMad: Telephone Area Codes & Splits Information about the original area codes from 1947, their evolution to the current state, and future developments including area code splits and overlays. Also features area code maps. http://www.LincMad.com/
NANPA Area Codes Search by area code or select by geographic location. Includes information on planned area codes not yet in service. http://www.nanpa.com/area_codes/
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. http://www.allareacodes.com/
Qwest: Area Codes Offers an easy to use clickable map interface. http://www.qwest.com/areaCodes/
1+ Area Codes & Country Codes Directory of U.S. area codes and international country calling codes. http://www.1AreaCodesCountryCodes.com/
Area Codes.org Search by area code, state abbreviation, or city name. http://www.areacodes.org/
Telephone Area Code Finder Area code and time zone information for North America. http://www.mmiworld.com/telephone.htm
SuperPhone.net: Area Code Finder Find area codes for North America and the Caribbean and country codes worldwide. http://www.superphone.net/area_state.html
