TelephoneCodes.com

exUSSR Phone Codes
Includes all cities of Russia, Ukraine, Belorussia, Moldova, Lithuania, Latvia, Estonia, Kazakhstan, Georgia, Uzbekistan, Azerbaijan, Armenia, Kirgizia, and Tadjikistan.
phonecodes.narod.ru/

Area Codes Listing
Lists North American area codes by number, region and time zone.
www.bennetyee.org/

Islands Philippines - Philippine Telephone Area Codes
Provides a list of telephone codes for Philippine cities, destinations and provinces.
phone-codes.islandsphilippines.com/

Simply Zip Codes
ZIP code, city/state, area code lookup along with distance calculations and population data.
www.simplyzipcodes.com/

International Calling Codes
Listing of international telephone country and city codes.
www.the-acr.com/

North American Numbering Plan Administration: Area Codes
Find North American codes by a map, number, or location.
www.nanpa.com/

International Dialing Codes
International and national direct dialing prefixes and instructions.
kropla.com/

Zip-codes.com
United States. Includes some statistics and histories of the post office and of the development of the ZIP (zone improvement plan).
www.zip-codes.com/

FAQs on Area Codes from FCC
The Federal Communications Commission answers frequently asked questions regarding area codes.
www.fcc.gov/

zipdecode
Java applet which maps United States zip codes on a map, reducing possible matches as the number is typed.
acg.media.mit.edu/