The 309 area code is located in the state of Illinois, and according to Intelius data, covers roughly 623,682 phone numbers and 887,548 listings across 786 prefixes.
This is a General Purpose Code, in service since January 1, 1957.
Area code 309 is part of an overlay complex shared with:
Local calls within area code 309 require 10 digits dialing, while long-distance calls require 1 plus 10 digits dialing.
Have you received a call from a number with a 309 area code? Figure out who is calling you by performing a reverse phone lookup search. Intelius can provide you with a phone report that includes (when available) original line type and carrier, the number owner’s name, last known address and past addresses, age, possible relatives, and more.
| County Population (2025) | 171,419 |
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