The 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-services overlay for the 309 area code. The 309 area code serves the west-central portion of
the state, including all or part of Bureau, Dewitt, Fulton, Hancock, Henderson, Henry, Knox, Marshall, Mason, McDonough, McLean, Mercer, Peoria, Rock Island, Schuyler, Stark, Tazewell, Warren,
Whiteside, and Woodford counties. The 309 area code serves cities and communities such as Bloomington, Canton, East Moline, East Peoria, Galesburg, Macomb, Moline, Normal, Pekin, Peoria, and Rock Island, as well as many other smaller communities. The new 861 area code will serve the same geographic area currently served by the 309 area code.

What is an Area Code Overlay?

An overlay is the addition of another area code (861) to the same geographic region as an existing area code (309). The overlay does not require you to change your existing area code or phone number, or how you dial your calls. You will continue to dial the area code and phone number for all local calls, as you do today, within and between the 309 and 861 area codes

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