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Area Codes
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Assist Book http://www.assistbook.com
Lists international dialing codes, area codes, weather, world time and currency exchange rates. Also has a reverse phone number lookup tool.
AT&T US Area Codes http://www.consumer.att.com/global/english/usa_codes.html
List of US area codes for each state, with a list of important cities and towns in each of the telephone area codes. Provides good information on overlays and splits.
CE - US Area Code Changes http://frodo.bruderhof.com/areacode/
Lists of exchanges that have moved or are moving from one North American area code to another.
CountryCallingCodes.com http://www.countrycallingcodes.com
Online tool that builds dialing codes based on locations selected. Includes many international dialing codes and some area codes. Also has a reverse phone number lookup tool and current time.
CountryCodes.com http://www.countrycodes.com
Online tool that build dialing codes based on locations selected. Lists many international dialing codes and some area codes.
Dial Code http://www.dial-code.com
Find international dialing codes and area codes by specifying location. Information on direct dial prefixes. Flash user interface.
Dial Codes Plus http://dialcodesplus.com/
Listing of international dialing codes and area codes with instructions.
exUSSR Phone Codes http://phonecodes.narod.ru/
Includes all cities of Russia, Ukraine, Belorussia, Moldova, Lithuania, Latvia, Estonia, Kazakhstan, Georgia, Uzbekistan, Azerbaijan, Armenia, Kirgizia, and Tadjikistan.
FAQs on Area Codes from FCC (USA) http://www.fcc.gov/Bureaus/Common_Carrier/Factsheets/areacode.html
The Federal Communications Commission answers frequently asked questions regarding area codes in the US.
Fone Finder http://www.fonefinder.net
Enter the 3-digit prefix or the city name to find an area code.
How to Call Abroad From US and Canada http://www.howtocallabroad.com/
Calling guide for United States and Canadian residents listing international country and city codes, phone books and time zones.
International Dialing Codes http://kropla.com/dialcode.htm
International and national direct dialing prefixes and instructions.
LincMad http://www.lincmad.com/
Information about North American area codes, featuring changes, historical data and area code map. Detailed information on overlays and splits.
North American Numbering Plan Administration: Area Codes http://www.nanpa.com/area_codes/index.html
Find North American codes by a map, number, or location. Includes information on future planned area codes and a free downloadable area code database.
NPA NXX Source http://www.npanxxsource.com
Databases for sale providing data on area codes and telephone exchange prefixes in the North American Numbering Plan.
Time and Date http://www.timeanddate.com/worldclock/dialing.html
International dialing codes for almost any country and area codes for many cities. The interface includes a dropdown selector and local times are provided with dialing codes.
Time Dial http://www.TimeDial.net
Displays the current time, international dialing code, area codes and currency converter for almost anywhere. Includes instructions on country codes and international dialing code parts usage.
TP2Location http://www.TP2Location.com
Resolve any telephone number to its geographical location.
UK Dial Me http://www.dialme.co.uk
A directory of telephone STD dialing codes in the UK.
UK Phone Information http://www.ukphoneinfo.com/
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 Code Answers http://www.areacodeanswers.com
Information about US-based area codes and prefixes. Find the city, carrier, location, and more information about any phone number with this free service.
US Area Code Finder http://www.areacodesearchengine.com
Area code lookup for the United States with maps. Search by state or by code.
US Area Code Locations http://www.areacodelocations.info
Provides a list of towns and cities covered by each US area code including overlays and splits.
US Area Codes, Rate Center, NPA, NXX etc Lookup http://www.localcallingguide.com/
A free resource aimed at VOIP and telephone companies or individuals that need to gather information about US phone numbers or to determine information such as which phone numbers would be local to a particular location. The data is availible as XML for computer programs to read.
US Switchboard - Area Code http://www.infospace.com/swbd.main/white-pages/reverse-lookup
Find United States area code by city and state, Find City and State by area code.
Verizon - US Area Code Lookup http://www22.verizon.com/areacodes/
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 http://iptop.net/eng/code.html
Contains world telephone codes and time zone information. Search by city, country or number.
World Telephone Numbering Guide http://www.wtng.info/
Lists and links to current international dialing codes and area codes with formatting guides and provides information on recent and historical changes.

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