Illinois Phone Number Lookup
Illinois has 17 telephone area codes in the North American Numbering Plan (NANP). Browse the directory to see each code's listed primary location, and select a code for available prefix, company, caller-report, and time-zone details.
An area code may serve multiple communities. The primary location shown here is the largest population center matched to that code in our database, not a complete list of every community served.
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Area Codes
| Area Code | Primary Location | Reports |
|---|---|---|
| 217 | Decatur | 4 reports |
| 224 | Elgin | 6 reports |
| 309 | Peoria | 8 reports |
| 312 | Wheeling | 10 reports |
| 331 | Aurora | 6 reports |
| 447 | Decatur | 2 reports |
| 464 | Cicero | 1 report |
| 618 | Belleville | 7 reports |
| 630 | Aurora | 11 reports |
| 708 | Cicero | 4 reports |
| 730 | Belleville | 4 reports |
| 773 | — | 5 reports |
| 779 | Joliet | 8 reports |
| 815 | Joliet | 10 reports |
| 847 | Elgin | 10 reports |
| 861 | — | 1 report |
| 872 | — | 6 reports |
Report Categories in Illinois
| Category | Reports |
|---|---|
| Unknown Caller | 71 |
| Scam | 25 |
| Debt Collection | 3 |
| Telemarketer | 3 |
| Robocall | 1 |
Top 10 Largest Cities in Illinois
| City | Population |
|---|---|
| Chicago city | 2,731,585 |
| Aurora city | 181,505 |
| Naperville city | 153,114 |
| Joliet city | 152,241 |
| Rockford city | 147,384 |
| Elgin city | 115,476 |
| Springfield city | 112,989 |
| Peoria city | 110,920 |
| Champaign city | 91,195 |
| Waukegan city | 87,940 |
Illinois Area Code Map
Recent Caller Reports in Illinois
Timezone
The listed area codes for Illinois primarily use the Central Timezone.
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