WorldCodes.com

Airport City Codes
Searchable by country, US state, city,or code. Includes runway length, elevation, latitude and longitude. Includes distance between airports, and aviation-related stories.
www.airportcitycodes.com/

Mapping.com Airport Codes
Includes both ICAO and IATA codes for over 21,000 airports worldwide.
www.mapping.com/

World Airport Codes
Reference site for airport codes and useful information like runway lengths, elevation, latitude and longitude data for each airport as well and WAC and GMT offset data.
www.world-airport-codes.com/

Airlines Of The Web - Airport Codes
Contains IATA airport codes for almost 2000 airports throughout the world.
flyaow.com/

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

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

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

Building Codes Assistance Project
Assists states in the development and implementation of statewide building energy codes.
www.bcap-energy.org/

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

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