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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 area code overlay plans in Illinois.
Find out the active area codes and exchanges for Chicago, IL, as well as the dates they were introduced and the companies that use them. Wirefly provides a comprehensive list, map, and phone lookup for Chicago area codes.
Area codes in Chicago, Illinois. Get the area’s map, current time, and prefixes for Chicago
Learn about the telephone area codes for the southern and western suburbs of Chicago in Illinois. Find out the service area, history, and transition to ten-digit dialing for 988.
Area code 312 covers the city of Chicago, including downtown and the Loop, and is surrounded by area code 773. Learn about its history, overlay complex, 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 area codes and zip codes, and the current time in Chicago.
1 Νοε 2024 · Important 312 Area Code Information. 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.
