The 309 area code covers Peoria, Bloomington and 157 more places in Illinois.
Area code 309 is in Illinois, on Central Time. In the 309 area, phone numbers are given out most in Peoria County, then McLean and Rock Island counties. It has been in service since 1957. 861 covers the same area, so two neighbours can have different area codes.
- Where
- 8 counties in Illinois, mostly Peoria County, McLean County and Rock Island County
- Time zone
- Central Time
- In service since
- 1957
- Shares its area with
- 861 (since 2023)
- Prefixes in use
- 786
- How to dial
- Local calls need all 10 digits: 309-555-0142.
Find out who called you from a 309 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (309) number is on today, use our free carrier lookup.
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Peoria holds 20% of the phone prefixes in area code 309.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 786 prefixes in use shows where 309 numbers are actually given out.
- Peoria155 prefixes, 20%
- Bloomington76 prefixes, 10%
- Rock Island41 prefixes, 5%
- Macomb23 prefixes, 3%
- Galesburg20 prefixes, 3%
- Pekin17 prefixes, 2%
- Moline17 prefixes, 2%
- East Moline16 prefixes, 2%
Also served: Canton, Kewanee, Morton and Monmouth and 147 smaller places.
Frontier holds the most phone number prefixes in area code 309: 143 of 786.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 786 prefixes in use in 309 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| FrontierLandline company | 143 | 18% |
| Illinois Bell (AT&T)AT&T's landline company | 83 | 11% |
| Level 3 (Lumen)Lumen's business and wholesale network | 66 | 8% |
| MediacomCable company's phone service | 47 | 6% |
| AT&T MobilityMobile network | 34 | 4% |
| T-MobileMobile network | 34 | 4% |
| 57 other carriers | 379 | 48% |
73% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
309 has been overlaid once since 1957.
1957
309 goes into service.
2023
On February 24, 2023, 861 is added on top of 309, so new numbers here can get either code.
A 309 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 309 are 217, 815 and 630.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
These are the questions people ask most about area code 309.
Where is area code 309?
309 covers Peoria, Bloomington, Rock Island and Macomb and 155 more places in Illinois. In the 309 area, phone numbers are given out most in Peoria County, then McLean and Rock Island counties.
What state is area code 309 in?
Illinois. 309 is an Illinois area code on Central Time.
What cities use area code 309?
The places holding the most 309 prefixes are Peoria, Bloomington, Rock Island, Macomb, Galesburg, Pekin, Moline and East Moline, out of 159 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 309?
No single phone company owns 309. NANPA's records show Frontier holds the most 309 prefixes, 143 of 786, followed by Illinois Bell (AT&T) and Level 3 (Lumen). Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 309 in?
309 is on Central Time.
When did area code 309 start?
309 went into service in 1957.
Is 309 the same area as 861?
Yes. 861 (since 2023) covers the same ground as 309. Nobody's number changed when it was added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 309 number?
Local calls need all 10 digits: 309-555-0142.
Is 309 a toll-free number?
No. 309 is a regular area code for Peoria and Bloomington in Illinois, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 309?
The closest are 217/447 (Springfield, Illinois), 815/779 (Rockford, Illinois), 630/331 (Roselle, Illinois) and 319 (Cedar Rapids, Iowa), measured between the centres of each area.
Who called me from a 309 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 309 a scam?
309 is a real Illinois area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.