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Area Code in Chicago, Illinois with detailed information about Chicago, IL Area Codes.
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.
Apr 29, 2024 · Chicago. Schaumburg. Wheeling. DuPage County. Hinsdale. Find out where 312 area code zone from, which states, counties and cities it covers. Get the most exact information on time zones here.
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.
Illinois Area Codes: List, Map, and Phone Lookup. There are 13 active area codes in the state of Illinois. Each of these area codes are listed below. There are two lists that Wirefly provides for the area codes in Illinois.
The City of Chicago has been served by area codes 312 and 773 since 1995. When 773 was added, the existing area code, 312, was split into two distinct areas. However, the new area code, 872 is being “overlaid” onto both the 312 and 773 area codes, and will be able to serve all parts of the city.
6 days ago · Data Last Updated: May 1, 2024. Zip-Codes.com. 630 Area Code. Download Area Code Database. Load 630 Area Code Map. Important 630 Area Code Information. Area Code 630 is located in Illinois. It covers 61 cities, including Chicago, Aurora, Naperville, Elgin, and Schaumburg.
