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US State Coverage

Illinois

Browse all 15 active Area Codes serving the state of Illinois.

Home › Illinois

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Capital City

Capital

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22,704,837

Population

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1884

Statehood

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Active Codes

Geographic Coverage

All Illinois Area Codes

217 View Details 224 View Details 309 View Details 312 View Details 331 View Details 447 View Details 464 View Details 618 View Details 630 View Details 708 View Details 773 View Details 779 View Details 815 View Details 847 View Details 872 View Details

About Illinois

Illinois is served by 15 unique area codes. Major metropolitan areas like Chicago typically have multiple overlays to support high demand.

Telecommunications Context

The telecommunications history of Illinois is a fascinating journey of growth and innovation. As one of the key regions in the national numbering plan, this area has seen numerous shifts from early manual exchanges to today's high-speed digital networks. Served by multiple area codes, Illinois continues to lead in connectivity, supporting both urban hubs and rural communities. Each area code within the state represents a unique geographic and economic sector, contributing to the overall connectivity of the nation.