Area code 309: where it is and who calls from it
Area code 309 is in Illinois.
Illinois (Peoria, Bloomington, Moline, Rock Island, Galesburg; west-central Illinois)
| Where | Illinois |
|---|---|
| Time zone | Central Time ยท local time |
| In service since | 1957 |
| Overlay | Yes, with 861 |
| Prefixes assigned | 786 of 792 possible (99%) |
Overlay: 309 covers the same area as 861. Overlay areas use 10-digit dialing, so a seven-digit number alone won't connect, and neighbors can have different area codes.
Where 309 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 309, with how many prefixes each has.
Plus 111 smaller rate centers.
Who holds 309 numbers
- Mobile carrier 19%
- Local phone company 33%
- Internet / business phone carrier 37%
- Phone company 12%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| Frontier | Local phone company | 143 | 18% |
| AT&T (local phone) | Local phone company | 85 | 11% |
| Onvoy | Internet / business phone carrier | 82 | 10% |
| Level 3 (Lumen) | Internet / business phone carrier | 66 | 8% |
| Verizon Wireless | Mobile carrier | 46 | 6% |
| Mediacom Telephony Of Illinois | Internet / business phone carrier | 39 | 5% |
| AT&T Mobility | Mobile carrier | 34 | 4% |
| T-Mobile (including Sprint) | Mobile carrier | 34 | 4% |
| Brightspeed Of Illinois | Local phone company | 24 | 3% |
| UScellular | Mobile carrier | 23 | 3% |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number.
States served: Illinois.
Other area codes in Illinois
217 224 312 331 447 464 618 630 708 730 773 779 815 847 861 872
Got a call from 309?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 309 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.