Area Codes in Illinois
Most populated cities in Illinois
Country Calling Code: +1
| Area Code | City | Administrative Region | Country Or Region | City Population | Timezone | Time | UTC |
|---|---|---|---|---|---|---|---|
| 217 | — | Illinois | United States | — | Central Time | 5:27 AM Sat | UTC-05 |
| 224 | — | Illinois | United States | — | Central Time | 5:27 AM Sat | UTC-05 |
| 309 | — | Illinois | United States | — | Central Time | 5:27 AM Sat | UTC-05 |
| 312 | Chicago | Illinois | United States | 2.7 million | Central Time | 5:27 AM Sat | UTC-05 |
| 314 | St. Louis | Missouri | United States | 319,294 | Central Time | 5:27 AM Sat | UTC-05 |
| 331 | Aurora, Illinois | Illinois | United States | 197,899 | Central Time | 5:27 AM Sat | UTC-05 |
| 563 | — | Iowa | United States | — | Central Time | 5:27 AM Sat | UTC-05 |
| 608 | — | Wisconsin | United States | — | Central Time | 5:27 AM Sat | UTC-05 |
| 618 | — | Illinois | United States | — | Central Time | 5:27 AM Sat | UTC-05 |
| 630 | — | Illinois | United States | — | Central Time | 5:27 AM Sat | UTC-05 |
| 708 | — | Illinois | United States | — | Central Time | 5:27 AM Sat | UTC-05 |
| 773 | Chicago | Illinois | United States | 2.7 million | Central Time | 5:27 AM Sat | UTC-05 |
| 779 | Rockford, Illinois | Illinois | United States | 152,871 | Central Time | 5:27 AM Sat | UTC-05 |
| 815 | — | Illinois | United States | — | Central Time | 5:27 AM Sat | UTC-05 |
| 847 | — | Illinois | United States | — | Central Time | 5:27 AM Sat | UTC-05 |
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