Indiana | Illinois | Michigan Illinois - Chicago Illinois Area CodesLast Change 2022 -- Next Changes -- Spring 2024 - 730 overlays 618 Late 2024 - 861 overlays 309 2030 - 847/224 2034 - 815/779 2035 - 217/447 2040 - 312/773/872 2053 - 630/331 2056 - 708/464 Area code boundries on this page are based on information from 1994 and may not be 100% accurate. | ||
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