thedirectory - Area Code 309 History

Area Code 309 History - Illinois

Significant events for area code 309

Date
Details

1957 Area code 309 was created with 309 covering the southwestern area of 815 and part of northern 217 .

February 24, 2023 Area code 309 was overlaid with 861 covering the Chicago suburbs.

Date	Details
1957	Area code 309 was created with 309 covering the southwestern area of 815 and part of northern 217 .
February 24, 2023	Area code 309 was overlaid with 861 covering the Chicago suburbs.

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