309 area code — Peoria, IL geographic

Data: NANPA public reports, current as of July 28, 2026.

If a call shows area code 309, the number was issued in the Peoria area — a code active since 1957, on Central time. It is part of the 309/861 overlay complex — these codes share the same territory. Note that porting and VoIP mean a 309 number can be used from anywhere — the code marks where the number was assigned.

779 central-office prefixes are currently active in this code, spread across 71 code-holding carriers. Thousands-block pooling applies to 567 prefixes, so a single prefix can belong to several carriers. Its prefixes map to 171 distinct rate centers.

NANPA projects numbering capacity for the 309/861 complex to exhaust in 4Q 2102.

It has since spawned 861 (2023).

Dialing: 10D locally, 10D to other codes (1+10 digit permissible at service provider discretion.).

If a 309 call asks for money or personal data, treat the displayed number as unverified: hang up and reach the organization through its published number. Numbering data locates numbers, not callers.

Largest localities in 309

FAQ

Is 309 a toll-free number?

No. 309 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.

Why do 861 and 309 cover the same place?

They are overlays: when a code runs low on numbers, a new code is added over the same territory instead of splitting it. The 309/861 complex shares one service area, and local calls are dialed with 10 digits.

Will 309 run out of numbers?

NANPA's current forecast projects exhaust in 4Q 2102 — decades of capacity remain.

Why am I getting spam calls from 309 numbers?

Scammers spoof recognizable area codes so calls look local or familiar. A displayed 309 number does not prove the call originated there — see our guide to spotting spoofed calls.