Illinois Area Codes
Compare 17 in-service area codes assigned to Illinois. Explore each code’s introduction date, overlays, possible time zones, and public prefix records.
Illinois numbering at a glance
- In-service area codes
- 17
- Time-zone labels in NANPA data
- Central
- Listed in-service or assigned prefixes
- 8,926 · source dated 2026-09-29
These are numbering assignments. The counts do not represent active phone numbers, current carriers, or a caller’s physical location.
Compare area codes in Illinois
| Code | Introduced | Other codes in overlay | Time zones | Listed prefixes |
|---|---|---|---|---|
| 217 | 01-Jan-1947 | 447 | Central | 786 |
| 224 | 05-Jan-2002 | 847 | Central | 589 |
| 309 | 01-Jan-1957 | 861 | Central | 780 |
| 312 | 01-Jan-1947 | 872 | Central | 784 |
| 331 | 07-Oct-2007 | 630 | Central | 222 |
| 447 | 27-Mar-2021 | 217 | Central | 212 |
| 464 | 21-Jan-2022 | 708 | Central | 105 |
| 618 | 01-Jan-1947 | 730 | Central | 786 |
| 630 | 03-Aug-1996 | 331 | Central | 781 |
| 708 | 11-Nov-1989 | 464 | Central | 783 |
| 730 | 07-Jul-2023 | 618 | Central | 124 |
| 773 | 12-Oct-1996 | 872 | Central | 785 |
| 779 | 17-Mar-2007 | 815 | Central | 346 |
| 815 | 01-Jan-1947 | 779 | Central | 786 |
| 847 | 20-Jan-1996 | 224 | Central | 785 |
| 861 | 24-Feb-2023 | 309 | Central | — |
| 872 | 07-Nov-2009 | 312, 773 | Central | 272 |
Source: NANPA NPA database, dated 2026-09-28. Prefix counts: NANPA US assignment report. View official area-code maps.
Overlay groups in Illinois
Codes in an overlay group can serve the same broad numbering area. A person may keep a number after moving, and the displayed number may be spoofed.
Find a number in Illinois
Open an area-code page above to check a prefix and possible time zones. You can also search US telephone rate-center names; those names are not exact city coverage.
A code cannot verify the owner of a number. If an unexpected caller asks for money or sensitive information, verify the claim independently.