Area Code 312

Country United States
State/Province Illinois 
Major City Chicago 
Easy URL 

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312 Area Code 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 homepage.

Some telephone area codes are overlaid, requiring 10-digit dialing. is your one-stop site for area code lookup, area code search, and area code locator.

Area Code 312 Detail

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.

312 Area Code Location
Major Cities County State/Province
Chicago  Cook  IL 
Other Cities By Name
Hinsdale  DuPage  IL 
La Grange  Brown  IL 
Northbrook  Cook  IL 
Roselle  DuPage  IL 
Wheeling  Cook  IL 

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