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Crystal Lake, Illinois Area Code |
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Crystal Lake, IL Area Codes are 779 and 815 |
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Crystal Lake, Illinois is currently assigned two area codes 779 and 815. Crystal Lake, 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 Crystal Lake, 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
Crystal Lake, 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 Crystal Lake, IL area
codes 779 and 815 serve the major communities of Belvidere, DeKalb, Freeport, Joliet, 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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