| 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 |
|---|---|---|---|
| 309-972 | Knox | Rio, IL | Oneida Network Services |
| 309-973 | Knox | Galesburg, IL | United States Cellular Corp. - Illinois |
| 309-975 | Fulton | Avon, IL | Sprint Communications Company, L.p. |
| 309-977 | Tazewell | Green Valley, IL | Mediacom Telephony Of Illinois |
| 309-981 | Peoria | Peoria, IL | Ymax Communications Corp. |
| 309-987 | Rock Island | Cordova, IL | Mediacom Telephony Of Illinois |
| 309-988 | Marshall | Lacon, IL | Sprint Spectrum L.p. |
| 309-989 | Peoria | Peoria, IL | T-mobile Usa |
| 309-992 | Peoria | Peoria, IL | Ameritech Illinois |
| 309-994 | Mclean | Bloomington, IL | Frontier North |
| 309-995 | Stark | La Fayette, IL | Mid Century Telephone Co-operative |
| 309-997 | Mcdonough | Good Hope, IL | Mediacom Telephony Of Illinois |
| 309-999 | Peoria | Peoria, IL | Ameritech Illinois |
| 309-555 | Used in movie | Bloomington, IL | Used in movie |
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.