Lists North American area codes by number, region and time zone.

Area code lookup with maps by state or by code.

Lists of exchanges that have moved or are moving from one North American area code to another.

Country, area and city codes and IDD (international direct dialing) prefixes.

Includes all cities of Russia, Ukraine, Belorussia, Moldova, Lithuania, Latvia, Estonia, Kazakhstan, Georgia, Uzbekistan, Azerbaijan, Armenia, Kirgizia, and Tadjikistan.

The Federal Communications Commission answers frequently asked questions regarding area codes.

Cross reference by area code and exchange to determine the telephone company and place name.

Listing of international telephone country and city codes.

International and national direct dialing prefixes and instructions.

Provides a list of telephone codes for Philippine cities, destinations and provinces.

Information about North American area codes, featuring changes and historical data.

Find North American codes by a map, number, or location.

Offers pulldown menus to lookup by city or area code.

Comprehensive search engine for dialing codes in the United Kingdom.

Returns area information, map, BT charge information, and nearby exchange names for telephone numbers, access/short codes, or the name of a location.