309 Area Code — Illinois
309 is a North American Numbering Plan area code for Illinois, the United States. It covers about 887,272 people in 199 towns and 242 ZIP codes, including Peoria, Bloomington and Normal.
| Field | Value |
|---|---|
| Area code | 309 |
| Country | United States (+1) |
| State / province | Illinois |
| Type | Standalone (no other NANP code covers the same towns) |
| Time zone | Central |
| Population covered | 887,272 |
| Towns covered | 199 |
| ZIP codes | 242 |
| Approx. centre | 40.818, -89.907 |
Where area code 309 is used
Area code 309 is assigned to Illinois, the United States, inside the North American Numbering Plan. Numbers in the code are written (309) NXX-XXXX at home and +1 309 NXX-XXXX when dialled from outside Canada and the United States. Since the NANP moved to 10-digit dialling you must always include the area code, even for a local call.
Towns and cities in area code 309
The 199 towns below are the largest in the 309 footprint, ranked by population. Every one of them links to its own page with the full list of area codes and ZIP codes for that town.
| Town | County | Population | ZIP codes |
|---|---|---|---|
| Peoria | Peoria County | 126,889 | 29 |
| Bloomington | McLean County | 85,628 | 8 |
| Normal | McLean County | 54,075 | 2 |
| Moline | Rock Island County | 43,748 | 2 |
| Pekin | Tazewell County | 40,577 | 3 |
| Rock Island | Rock Island County | 36,766 | 3 |
| Galesburg | Knox County | 32,203 | 2 |
| Washington | Tazewell County | 24,470 | 1 |
| East Peoria | Tazewell County | 24,040 | 2 |
| East Moline | Rock Island County | 23,308 | 1 |
| Morton | Tazewell County | 18,792 | 1 |
| Macomb | McDonough County | 17,317 | 1 |
Counties covered
| County | ZIP codes |
|---|---|
| Peoria County | 45 |
| McLean County | 29 |
| Rock Island County | 20 |
| Fulton County | 20 |
| Tazewell County | 18 |
| Knox County | 17 |
| Henry County | 15 |
| Mercer County | 13 |
| Woodford County | 12 |
| McDonough County | 10 |
| Warren County | 8 |
| Marshall County | 7 |
Nearby area codes
How to dial area code 309
- Within North America: 309 + 7-digit number (309-NXX-XXXX). The leading 1 is optional on a mobile phone and required on most landlines for long-distance.
- From abroad: your country's international prefix, then 1, then 309, then the 7-digit number — for example 00 1 309 NXX-XXXX from most of Europe.
Frequently asked questions
What area code is 309?
309 is a North American Numbering Plan area code assigned to Illinois, the United States. It covers about 887,272 people in 199 towns.
Is 309 a US or Canadian area code?
309 is a United States area code. Canada and the United States share the +1 country code, so both are part of the same numbering plan.
What time zone is area code 309 in?
Area code 309 is in the Central time zone.
Do I have to dial 10 digits?
Yes. Every NANP call now requires the area code plus the seven-digit number, even for a local call.