Rock Falls, Illinois Area Code

Rock Falls, IL Area Codes are

815 and 779

Rock Falls, 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 Rock Falls, IL area code information read more about area codes 779 and 815 details and Illinois area codes.

Rock Falls, IL is located in Whiteside County and observes the Central Time Zone.
View our Times by Area Code tool.

Illinois Area Code Map


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