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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. 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. It ...
Find out the phone prefixes and location of the 312 area code, which is assigned for use in Illinois since 1947. See the list of phone companies and service providers that operate in this area code and how to lookup any phone number.
- IL-US
Find out the location, cities, map and time of area code 312, which serves the downtown area of Chicago and some nearby places. See the list of NPANXX and date of overlay for each zone of 312 area code.
Find phone numbers and locations for the 312 area code, which covers Chicago and some parts of New York. See prefixes, zip codes, and major cities in the 312 area code.
Find out the details of the 312 area code, which covers Chicago and some nearby areas in Illinois. See the list of prefixes, companies, and dates of assignment, as well as the current time and overlay information.
Find out the location, timezone, population and adjacent area codes of area code 312 in Illinois. See the interactive map and list of ZIP codes and counties in area code 312.
