Where is Area Code 309?
Area code 309 is found in the US state of Illinois. Primarily servicing the city of Peoria (population: 136591), area code 309 covers 20 counties of Illinois.
Located in the Central time zone, area code 309 is on the same time as Chicago, IL.
Area code 309 was brought into effect on January 1, 1957.
Counties in Area Code 309
- Dewitt,
- Fulton,
- Hancock,
- Henderson,
- Henry,
- Knox,
- Marshall,
- Mason,
- McDonough,
- McLean,
- Mercer,
- Peoria,
- Rock Island,
- Stark,
- Tazewell,
- Warren,
- Whiteside,
- Woodford.
Most Populous Cities in Area Code 309
| City | County | City Population |
|---|---|---|
| Peoria | Peoria | 136,591 |
| Bloomington | McLean | 85,694 |
| Normal | McLean | 53,723 |
| Moline | Rock Island | 45,071 |
| Pekin | Tazewell | 43,989 |
| Rock Island | Rock Island | 39,092 |
| Galesburg | Knox | 34,349 |
| East Peoria | Tazewell | 25,386 |
| East Moline | Rock Island | 24,038 |
| Washington | Tazewell | 23,841 |
| Macomb | McDonough | 22,035 |
| Morton | Tazewell | 17,793 |
| Canton | Fulton | 17,637 |
| Kewanee | Henry | 14,120 |
| Metamora | Woodford | 12,180 |
| Monmouth | Warren | 11,656 |
| Geneseo | Henry | 11,339 |
| Chillicothe | Peoria | 11,248 |
| Milan | Rock Island | 10,540 |
| Dunlap | Peoria | 9,057 |
| Silvis | Rock Island | 7,804 |
| Colona | Henry | 7,077 |
| Eureka | Woodford | 6,766 |
| Peoria Heights | Peoria | 6,140 |
| Coal Valley | Rock Island | 5,860 |
Note: The above list is based off of the top 25 most populous cities in the area code as per 2012 United States Census Bureau estimates.
View all United States Area Codes.