Stillman Valley, Illinois Area Code

Stillman Valley, IL Area Codes are

815 and 779

Stillman Valley, IL is officially utilizing an area code overlay in which area codes 779 and 815 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary.

In addition to Stillman Valley, IL area code information read more about area codes 779 and 815 details and Illinois area codes.

Stillman Valley, IL is located in Ogle County and observes the Central Time Zone.
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Illinois Area Code Map