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Find out the area codes for different regions of Illinois, including Chicago and its suburbs. Learn about the history and current status of overlay plans and ten-digit dialing in Illinois.
Chicago, IL has the following Exchanges (NXX) List of all area codes in Chicago, IL. Chicago, IL area code map, list, and phone lookup.
Prefixes – 1708 codes. Area codes in Chicago, Illinois. Get the area’s map, current time, and prefixes for Chicago.
Area code 312 covers the city of Chicago, including downtown and the Loop, and is surrounded by area code 773. Learn about its history, geography, overlay, and popular culture references.
Find the local area code for Chicago, Illinois and learn how to dial it from any country. See the list of Chicago zip codes and the current time in 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.
1 Νοε 2024 · Area Code 312 is located in Illinois. It covers 16 cities, including Chicago, Cicero, Schaumburg, Glenview, and Buffalo Grove. It also covers 3 counties, including Cook County, Lake County, Dupage County. A full list of covered cities and counties is below including its prefix and population coverage.
