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773: Chicago, covers most of the geographical area of Chicago except the downtown Chicago Loop, which is in area code 312. 815/779 : Northern Illinois outside of the immediate Chicago area including Joliet , Kankakee , LaSalle , DeKalb , and Rockford .
Chicago, IL has the following Exchanges (NXX) List of all area codes in Chicago, IL. Chicago, IL area code map, list, and phone lookup.
Find the local area code for Chicago, Illinois. Our complete calling resource guide instantly gives you the the Chicago area code and local time to help you make your long distance call to Chicago, Illinois.
Area codes in Chicago, Illinois. Get the area’s map, current time, and prefixes for Chicago
The 312 area code is Chicago’s historic telephone code, established by the North American Numbering Plan Administrator (NANPA) in 1947. It is one of the leading telephone codes for this central business area of Chicago, including downtown and the Chicago Loop, with its vibrant music scene and great architecture.
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.
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.
