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Joliet, Illinois Area Code |
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Joliet, IL Area Codes are 779 and 815 |
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Joliet, Illinois is currently assigned two area codes 779 and 815. Joliet, IL utilizes an area code overlay in which area
codes 779 and 815 serve the same geographic area. The area code overlay which is in use in Joliet, IL today was put into service on March 17, 2007 when area code 779 was created as an overlay of area code
815. Area code 815 was put into service in 1947 and was one of the four original area codes assigned to Illinois. Ten digit dialing (area code + seven digit number) is necessary in Joliet, IL because two
different homes in the same geographic area can have the same seven digit phone number but each would have a different area code.
In addition to Joliet, IL area codes 779 and 815 serve the major
communities of Belvidere, Crystal Lake, DeKalb, Freeport, Kankakee, Loves Park, Machesney Park, McHenry, Rockford, Romeoville and Woodstock, along with many smaller towns and communities in northern Illinois.
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Illinois Area Codes |
217, 224, 309, 312, 331, 618, 630, 708, 773, 779, 815, 847, 872 |
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