| 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 |
|---|---|---|---|
| 309-307 | Mclean | Bloomington, IL | 365 Wireless |
| 309-308 | Peoria | Peoria, IL | 365 Wireless |
| 309-310 | Mclean | Bloomington, IL | Sprint Spectrum L.p. |
| 309-312 | Henry | Kewanee, IL | Sprint Spectrum L.p. |
| 309-313 | Mcdonough | Macomb, IL | Mci Worldcom Communications |
| 309-314 | Rock Island | Moline, IL | Sprint Spectrum L.p. |
| 309-315 | Knox | Galesburg, IL | Centurylink Communications LLC |
| 309-318 | Mcdonough | Macomb, IL | Sprint Spectrum L.p. |
| 309-319 | Mclean | Bloomington, IL | Mci Worldcom Communications |
| 309-321 | Tazewell | Morton, IL | Level 3 Communications |
| 309-323 | Peoria | Peoria, IL | Bandwidth.com Clec |
| 309-325 | Warren | Smithshire, IL | Mcdonough Telephone Cooperative |
| 309-326 | Fulton | Canton, IL | Teleport Communications America |
| 309-329 | Fulton | Astoria, IL | Frontier North |
| 309-330 | Mason | Havana, IL | Bitwise Communications |
| 309-331 | Mcdonough | Macomb, IL | United States Cellular Corp. - Illinois |
| 309-333 | Mcdonough | Macomb, IL | United States Cellular Corp. - Illinois |
| 309-334 | Henry | Woodhull, IL | Woodhull Community Telephone Co. |
| 309-335 | Knox | Galesburg, IL | Cellco Partnership DBA Verizon Wireless |
| 309-336 | Mclean | Bloomington, IL | Sprint Spectrum L.p. |
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.