Illinois area codes
- Area codes in
- 13
- State
- Illinois
- Local time
- Central Time
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 28 July 2026
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 | 815 | |
| 224 | Elgin | — | 2002 | 847 | 261 |
| 309 | Peoria | — | 1957 | 201 | |
| 312 | Chicago | — | 1947 | 279 | |
| 331 | Aurora | — | 2007 | 630 | 164 |
| 618 | Belleville | — | 1947 | 488 | |
| 630 | Naperville | — | 1996 | 429 | |
| 708 | Cicero | — | 1989 | 732 | |
| 773 | Chicago | — | 1996 | 320 | |
| 779 | Rockford | — | 2007 | 815 | 129 |
| 815 | Rockford | — | 1947 | 1,135 | |
| 847 | Evanston | — | 1996 | 319 | |
| 872 | Chicago | — | 2009 | 312 | 325 |
Illinois area code map
Illinois sits in the Central Time zone, with its 13 codes spread across the state.
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.
Rockford
Aurora
Belleville
Cicero
Elgin
Evanston
Naperville
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.
Spam call reports in Illinois
These Illinois area codes drew the most reports to the FTC in the 30 days to 28 July 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 |
|---|---|---|
| 815 | Rockford | 1,135 |
| 217 | Springfield | 815 |
| 708 | Cicero | 732 |
| 618 | Belleville | 488 |
| 630 | Naperville | 429 |
| 872 | Chicago | 325 |
| 773 | Chicago | 320 |
| 847 | Evanston | 319 |
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 28 July 2026. Request a correction.
Calls from your Illinois numbers not landing?
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, anywhere an overlay operates. 4 of Illinois’s codes are overlays, and ten-digit dialling is required for local calls in those areas.
Which Illinois area code gets the most spam calls?
Area code 815 (Rockford) drew the most reports of any Illinois code in the 30 days to 28 July 2026, with 1,135 numbers reported.