| District of Illinois area codes: 309 | |
|---|---|
| Country | United States |
| State/Province | Illinois |
| Major City | Peoria |
| Time Zone | Central (UTC-06:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 309-403 | Peoria | Peoria, IL | Level 3 Communications |
| 309-404 | Peoria | Peoria, IL | Level 3 Communications |
| 309-405 | Peoria | Peoria, IL | Level 3 Communications |
| 309-406 | Peoria | Peoria, IL | Level 3 Communications |
| 309-407 | Peoria | Peoria, IL | Level 3 Communications |
| 309-408 | Peoria | Peoria, IL | Level 3 Communications |
| 309-409 | Peoria | Peoria, IL | Level 3 Communications |
| 309-410 | Peoria | Peoria, IL | Level 3 Communications |
| 309-412 | Peoria | Peoria, IL | Level 3 Communications |
| 309-413 | Peoria | Peoria, IL | Level 3 Communications |
| 309-414 | Peoria | Peoria, IL | Level 3 Communications |
| 309-415 | Peoria | Peoria, IL | Level 3 Communications |
| 309-416 | Peoria | Peoria, IL | Level 3 Communications |
| 309-417 | Peoria | Peoria, IL | Level 3 Communications |
| 309-418 | Peoria | Peoria, IL | Level 3 Communications |
| 309-419 | Peoria | Peoria, IL | Level 3 Communications |
| 309-420 | Peoria | Peoria, IL | Level 3 Communications |
| 309-421 | Mcdonough | Macomb, IL | Comcast Phone Of Illinois DBA Comco |
| 309-422 | Peoria | Peoria, IL | Level 3 Communications |
| 309-423 | Peoria | Peoria, IL | Level 3 Communications |
There are 634 prefixes, In the code area, the major cities are Bloomington, IL;East Moline, IL;East Peoria, IL;Ga. The major city is Peoria.