International Dialing Codes
International and national direct dialing prefixes and instructions.
Interworldcodes
International telephone dialing country and city codes directory.
Islands Philippines - Philippine Telephone Area Codes
Provides a list of telephone codes for Philippine cities, destinations and provinces.
LincMad
Information about North American area codes, featuring changes and historical data.
North American Numbering Plan Administration: Area Codes
Find North American codes by a map, number, or location.
NPA NXX Source
Complete coverage of all area codes and telephone exchange prefixes in the North American Numbering Plan.
Quick Area Code Finder
Offers pulldown menus to lookup by city or area code.
Switchboard - Area Code
Find area code by city and state, Find City and State by area code.
UK Phone Information
Returns area information, map, BT charge information, and nearby exchange names for telephone numbers, access/short codes, or the name of a location.
US Area Codes
Unites States area codes directory and lookup tool.
Verizon - Area Code Lookup
Find the major locations in a certain area code by entering the area code, or find the area codes that are used in a certain state by entering the state name.
World Search Dial Codes
Contains telephone codes and time zone information.
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