Listing of international telephone country and city codes.

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

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

International and national direct dialing prefixes and instructions.

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

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

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

Area code lookup with maps by state or by code.

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

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