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Illinois area codes

A checked list of 17 in-service geographic area codes in Illinois, with their dates, overlay partners and dialing rules.

Last checked 14 October 2026

Area codes across North America

Codes in service in Illinois

Illinois has 17 geographic area codes in service: 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861, 872. 217 is the oldest, dated 1947, and 730 the newest, dated 7 Jul 2023.1 All of Illinois's codes are on Central time.

Area codeNANPA locationNPA in-service dateIn-service overlay peersTime zoneLocal calls within the code
217IL1947447Central10 digits
224IL5 Jan 2002847Central1 + 10 digits
309IL1957861Central10 digits
312IL1947872Central1 + 10 digits
331IL7 Oct 2007630Central1 + 10 digits
447IL27 Mar 2021217Central10 digits
464IL21 Jan 2022708Central1 + 10 digits
618IL1947730Central10 digits
630IL3 Aug 1996331Central1 + 10 digits
708IL11 Nov 1989464Central1 + 10 digits
730IL7 Jul 2023618Central10 digits
773IL12 Oct 1996872Central1 + 10 digits
779IL17 Mar 2007815Central1 + 10 digits
815IL1947779Central1 + 10 digits
847IL20 Jan 1996224Central1 + 10 digits
861IL24 Feb 2023309Central10 digits
872IL7 Nov 2009312, 773Central1 + 10 digits

Scroll the table sideways to see every column. Sources: NANPA (14 October 2026 file).

History and overlays in Illinois

  • Before 1960: 217, 312, 618, 815, 309
  • 1960 to 1989: 708
  • 1990s: 847, 630, 773
  • 2000s: 224, 779, 331, 872
  • 2020s: 447, 464, 861, 730

Illinois's in-service overlay groups are 217/447; 224/847; 309/861; 312/872; 331/630; 464/708; 618/730; 773/872; 779/815.1

  • 618/730: 618 (1947) was joined by 730 on 7 Jul 2023.
  • 217/447: 217 (1947) was joined by 447 on 27 Mar 2021.
  • 309/861: 309 (1957) was joined by 861 on 24 Feb 2023.
  • 312/872: 312 (1947) was joined by 872 on 7 Nov 2009.

Illinois has 5 more overlay groups, visible in the table above.

Dialing in Illinois

Local calls within a single area code in Illinois differ: 10 digits for 217, 309, 447, 618, 730, 861; 1 + 10 digits for 224, 312, 331, 464, 630, 708, 773, 779, 815, 847, 872. In Illinois, local calls to other area codes differ: 10 digits for 217, 309, 447, 618, 730, 861; 1 + 10 digits for 224, 312, 331, 464, 630, 708, 773, 779, 815, 847, 872.1

Neighbours of Illinois

Regions that border Illinois:

  • Indiana: 8 codes (219, 260, 317, 463, ...)
  • Iowa: 5 codes (319, 515, 563, 641, ...)
  • Kentucky: 5 codes (270, 364, 502, 606, ...)
  • Missouri: 9 codes (235, 314, 417, 557, ...)

Rules that apply to every region are on the area-code reference.

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Further reading

Longer research pieces on this topic, each with its own source list and a downloadable PDF.

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Sources

Every regulatory and pricing claim on this page links to the primary source it came from. Figures were checked on the date shown at the top of the page; rules and prices change, so verify before relying on one.

  1. NANPA, NPA Database CSV, file dated 14 October 2026; US geographic codes, location, dates, overlay complexes, dialing plan and time zone. Retrieved 14 Oct 2026
    https://reports.nanpa.com/public/npa_report.csv

Keep reading

Reference
How overlays work
Why two codes can serve the same area and what ten-digit dialling changes.
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