Illinois area codes
Illinois has 17 area codes, all on UTC−6 standard time. Each card shows the main cities; open one for its overlays, history and a free lookup.
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Illinois area code questions
How many area codes does Illinois have?
Illinois has 17 area codes in service: 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861 and 872.
What was the original Illinois area code?
217, 312, 618 and 815 were among the original area codes created in 1947.
What is the newest area code in Illinois?
730, in service since July 7, 2023 as an overlay on 618.
What time zone is Illinois area codes in?
Central.
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Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.