Area Codes in Castleton
| Area Code▲ | City↕ | Administrative Region↕ | City Population↕ | Country/Region | Timezone |
|---|---|---|---|---|---|
| 309 | — | Illinois | 12,772,888 | United States | America/Chicago |
Nearby Cities
| City | Region | Country | Population | Area Codes | Zip Codes |
|---|---|---|---|---|---|
| Bradford, Illinois | Illinois | United States | 768 | 815, 309 | 61421 |
| Camp Grove, Illinois | Illinois | United States | — | 309 | 61424 |
| Speer, Illinois | Illinois | United States | — | 309 | 61479 |
| Toulon, Illinois | Illinois | United States | 1,292 | 309 | 61483 |
| Wyoming, Illinois | Illinois | United States | 1,429 | 309 | 61491 |