Illinois area codes
- Area codes in
- 13
- State
- Illinois
- Illinois is served by 13 area codes, from 217 in 1947 to 872 in 2009. 4 of them are overlays, added as older codes filled up.
- Updated 8 October 2026
Now in Illinois
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Typical business hours, 9 to 5 Monday to Friday, shown as the blue arc. A guide to when a real Illinois office is likely to answer. It says nothing about who called you.
01
All area codes in Illinois
Illinois is served by 13 area codes. 217 is the oldest, in service since 1947; 872 is the newest, activated in 2009.
| Primary city | Region | Overlay of | ||||
|---|---|---|---|---|---|---|
| 217 | Springfield | — | 1947 | — | 723 | |
| 224 | Elgin | — | 2002 | 847 | 512 | |
| 309 | Peoria | — | 1957 | — | 341 | |
| 312 | Chicago | — | 1947 | — | 363 | |
| 331 | Aurora | — | 2007 | 630 | 285 | |
| 618 | Belleville | — | 1947 | — | 678 | |
| 630 | Naperville | — | 1996 | — | 590 | |
| 708 | Cicero | — | 1989 | — | 919 | |
| 773 | Chicago | — | 1996 | — | 436 | |
| 779 | Rockford | — | 2007 | 815 | 182 | |
| 815 | Rockford | — | 1947 | — | 708 | |
| 847 | Evanston | — | 1996 | — | 491 | |
| 872 | Chicago | — | 2009 | 312 | 436 |
02
Illinois area codes by city
These are the Illinois cities served by more than one area code, or whose code also covers a wider area.
03
Overlay codes and dialling rules in Illinois
4 of Illinois’s 13 area codes are overlays — a second code laid over an existing footprint instead of splitting it. Wherever an overlay operates, local calls require the full ten-digit number.
04
Spam call reports in Illinois
These Illinois area codes drew the most reports to the FTC in the 30 days to 8 October 2026. The figures describe numbers displaying each code, which caller ID spoofing can fake.
Most reported Illinois area codes · last 30 days
| # | Code | Primary city | Reports (30 days) |
|---|---|---|---|
| 1 | 708 | Cicero | 919 |
| 2 | 217 | Springfield | 723 |
| 3 | 815 | Rockford | 708 |
| 4 | 618 | Belleville | 678 |
| 5 | 630 | Naperville | 590 |
| 6 | 224 | Elgin | 512 |
| 7 | 847 | Evanston | 491 |
| 8 | 773 | Chicago | 436 |
A number listed here may itself be a spoofing victim rather than the caller. These are unverified consumer reports.
Source: FTC Do Not Call Reported Calls Data, unverified consumer reports, retrieved 8 October 2026. Request a correction. Month-over-month figures appear once two complete 30-day windows exist.
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05
Questions
How many area codes does Illinois have?
Illinois has 13 area codes: 217, 224, 309, 312, 331, 618, 630, 708, 773, 779, 815, 847, 872.
What is the main area code for Chicago?
The main area code for Chicago is 312.
Which Illinois area code is oldest?
Area code 217 is the oldest in Illinois, in service since 1947.
Do I need to dial ten digits in Illinois?
Yes, wherever an overlay operates. 4 of Illinois’s area codes are overlays, and local calls within an overlay area require the full ten-digit number.
Which Illinois area code gets the most spam calls?
Area code 708 (Cicero) drew the most reports of any Illinois code in the 30 days to 8 October 2026, with 919 numbers reported.
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