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Area code 312 is a telephone area code in the North American Numbering Plan for the city of Chicago, including downtown, the Chicago Loop, and its immediate environs. The numbering plan area is completely surrounded by area code 773, which serves the rest of Chicago.
312 is an area code located in the state of Illinois, US. The largest city it serves is Chicago. Location, time zone and map of the 312 area code
Area code 312 serves the state of Illinois. This area code was assigned on January 1st, 1947. On January 1st, 1947 it went into service. 312 is a General Purpose Code. 312 service area does overlap with 872 area codes. Dialing pattern for local calls within the same NPA (area code) is 1+10D.
Area code 312 is located in Illinois. Get area code location and dialing plans for all phone prefixes in area code 312.
312 Area Code located in Illinois, including 16 cities, 3 counties, 1 time zone, map, Census demographics, and 779 active prefixes.
Lookup information on Area Code 312 - get demographic, NPA NXX, and other data by area code
Area code 312 is an area code that is part of Illinois. It was one of the first area codes created in 1947. It initially covered the entire northeastern portion of Illinois, but after it was split by 708 in 1989, 630, 847, and 773, all in 1996, it now covers only downtown Chicago, with 708 and 773 covering the rest of Chicago.
Area code 312 is an Illinois area code that covers Chicago and part of its surrounding area. Area code 312 overlays the area code of 872. Cities that use 312 area code and a coverage map included as well.
Explore the local number for Chicago, Illinois, within the 312 area code serving the counties and cities locals personally and professionally.
Profile and Interactive Map for Area Code 312 in Illinois - October, 2024.