| 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 |
|---|---|---|---|
| 309-244 | Tazewell | Delavan, IL | Ameritech Illinois |
| 309-245 | Fulton | Farmington, IL | Ameritech Illinois |
| 309-246 | Marshall | Lacon, IL | Gallatin River Communications DBA Centurylink |
| 309-247 | Mason | San Jose, IL | Ameritech Illinois |
| 309-248 | Woodford | Washburn, IL | Frontier North |
| 309-249 | Peoria | Edelstein, IL | Frontier North |
| 309-250 | Peoria | Edelstein, IL | Bitwise Communications |
| 309-251 | Peoria | Peoria, IL | United States Cellular Corp. - Illinois |
| 309-252 | Mcdonough | Macomb, IL | Cellco Partnership DBA Verizon Wireless |
| 309-253 | Peoria | Peoria, IL | Cellco Partnership DBA Verizon Wireless |
| 309-254 | Mcdonough | Industry, IL | Mcdonough Telephone Cooperative |
| 309-255 | Mcdonough | Macomb, IL | Cellco Partnership DBA Verizon Wireless |
| 309-256 | Peoria | Peoria, IL | Cellco Partnership DBA Verizon Wireless |
| 309-257 | Schuyler | Littleton, IL | Mcdonough Telephone Cooperative |
| 309-258 | Peoria | Peoria, IL | Cellco Partnership DBA Verizon Wireless |
| 309-259 | Mcdonough | Macomb, IL | Cellco Partnership DBA Verizon Wireless |
| 309-261 | Mclean | Bloomington, IL | Sprint Spectrum L.p. |
| 309-262 | Mclean | Bloomington, IL | Sprint Spectrum L.p. |
| 309-263 | Tazewell | Morton, IL | Frontier North |
| 309-264 | Peoria | Peoria, IL | Cellco Partnership DBA Verizon Wireless |
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.