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New 861 Area Code is Coming to the Illinois 309 Area Code Region

To ensure a continuing supply of telephone numbers, the Illinois Commerce Commission has approved an all-service overlay for the 309 area code. The new 861 area code will serve the same geographic area currently served by the 309 area code.

Who is affected and when does the new 861 area code become effective?

Beginning February 24, 2023, residents and businesses in the 309 area code region may be assigned a number in the new 861 area code when they request new service or an additional line. Customers receiving the 861 area code will be required to dial the area code and phone number for all local calls, just as customers with telephone numbers from the 309 area code do today.

What will you need to do?
What will remain the same?
Who may you contact with questions?

If you have any questions regarding the information provided in this notice, please call MTCO at 309-367-4197. You may also visit the Illinois Commerce Commission website at https://www.icc.illinois.gov/programs/Area-Codes .
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