309 Area Code — Peoria, IL
Area code 309 serves Peoria and 3 other cities in Illinois. Local time follows America/Chicago. It overlays with 861, so 10-digit dialling is required.
- State
- Illinois
- Primary city
- Peoria
- Timezone
- America/Chicago
- In service since
- 1957
- Type
- Geographic
- Overlay codes
- 861
Cities Served by 309
The 309 area code covers 4 cities and communities in Illinois.
- Peoria
- Bloomington
- Quincy
- Galesburg
About Area Code 309
Area code 309 is a North American Numbering Plan (NANP) area code that has been in service since 1957. It is administered by NANPA on behalf of the FCC and serves the Illinois region anchored on Peoria.
309 now shares its territory with an overlay code (861). 10-digit dialling is required for local calls within this region because the same 7-digit number can be assigned under either code.
Mobile numbers in 309 are portable: a person who moved away from Peoria may still carry a 309 mobile number on their device. If you receive an unexpected call from a 309 number, run it through the reverse lookup tool above for the most accurate, free identification.
If you live or do business in Illinois, you may also interact with neighbouring or overlay codes (861). See the related codes section below to explore the rest of Illinois.
Other Illinois Area Codes
Continue exploring the Illinois numbering plan.
309 Area Code FAQ
Where is area code 309?
Area code 309 is located in Illinois, primarily serving Peoria and surrounding cities including Bloomington, Quincy, Galesburg. The region operates on CT (America/Chicago) time.
What state is 309 area code?
309 is a Illinois area code. It was put into service in 1957 and shares its geographic footprint with overlay code 861.
Is 309 a scam area code?
309 is a legitimate North American area code allocated by NANPA to Illinois. Like any geographic area code, scammers sometimes spoof 309 numbers — judge each call by content (urgent demands, unfamiliar transfers) rather than the area code alone. Run the specific number through our reverse lookup if you're unsure.
What time zone does 309 use?
Area code 309 operates on CT (America/Chicago). Numbers in this area code follow standard Illinois time-zone rules including any daylight-saving transitions for that region.
Can I look up a specific 309 phone number?
Yes. Use the reverse lookup widget above to enter a full 309 number. NumLocation returns the line type (mobile, landline, VoIP), carrier, rate-center city, and any public listings tied to the number — free.
What's the difference between 309 and 861?
309 and 861 cover the same Illinois geographic area as overlay codes. Calls between them are local, but you must dial all 10 digits. New phone numbers in this region are assigned from either pool depending on what's available with the carrier at signup.