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AreaCode.org is an excellent resource for area code lookup and area codes phone information. Here you'll find an area codes list of area codes within the United States, plus Canada area codes.
For a full list of area codes, visit AreaCode.org. It provides USA area codes and an area code map. Mexico area code is not included in the North American Numbering Plan.
AreaCode.org is a resource of North American telephone area codes. Beyond area code listings, relevant information about each area code is detailed. You can also search area codes by state, and within the NANP, find country area codes.
The area codes locator shows the coverage area for each phone number area code. Area code locations are also listed by city next to the area code maps on this page.
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AreaCode.org shows you the area code location covered by each area code; for example, the LA area code coverage area in Los Angeles. State area codes may be found using AreaCode.org, but Mexico area codes are not included.
The telephone area code is dialed before the local number. For area codes by city, search AreaCode.org. Area codes telephone differ from region to region, and in some places the area code must be dialed even when calling locally within that region. Find out more with area code decoder. Not looking for Chicago 312 area code information? We also have Cicero 708 area code information for the 708 Area Code and Chicago 773 area code information for the 773 Area Code.
AreaCode.org is an area code finder with detailed information on the 312 area code including 312 area code map.
Major cities like Chicago within area code 312 are also listed on this page. More area codes, including those outside of Illinois, are found on the AreaCode.org homepage.
Some telephone area codes are overlaid, requiring 10-digit dialing. AreaCode.org is your one-stop site for area code lookup, area code search, and area code locator.
312 serves the Chicago Loop of the city of Chicago, Illinois. It encompasses only a few square miles, roughly bounded by North Avenue to the north, Ashland Avenue to the west, Lake Michigan on the east, and 31st Street on the south.
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