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US area code · Illinois

309 area code

Where the 309 area code is, its overlay and how to dial a +1 309 number from anywhere.

CoversBloomington, IllinoisTime zoneCentral (CT)TypeOverlay
Quick answer

The 309 area code is in Bloomington, Illinois, United States (Central (CT)). To call from abroad: +1 309 555-0123. It is an overlay, so all 10 digits are dialled.

StateIllinois
Main areaBloomington
Time zoneCentral (CT)
TypeOverlay
10-digit dialingRequired
In service since01-Jan-1957

The 309 area code is a geographic North American Numbering Plan (NANP) code covering Bloomington, Illinois. It has been in service since 01-Jan-1957 and sits in the Central (CT) time zone.

Overlay 309 shares its region

Several area codes cover the same geographic area, so two neighbours can have different codes. Because of the overlay, you must dial all 10 digits (area code + number) even for local calls.

309861

How to dial a 309 number

From abroad+1 309 555-0123
Within the US / Canada1 309 555-0123
Locally (same area)309 555-0123

Cities in the 309 area code

A 309 number is usually in one of these places in Illinois — 5 counties.

Bloomington McleanEast Moline Rock IslandEast Peoria TazewellGalesburg KnoxMoline Rock IslandNormal McleanPekin TazewellPeoria PeoriaRock Island Rock Island

Other Illinois area codes

217224312331447464618630708730773779815847861872

Frequently asked questions

Where is the 309 area code?

The 309 area code is in Bloomington, Illinois, United States (Central (CT)).

Is 309 an overlay area code?

Yes. 309 overlays the same region as 861, so callers dial all 10 digits.

Do I have to dial 10 digits for 309?

Yes — dial the area code plus the seven-digit number.

How do I call a 309 number from another country?

Dial your exit code (or +), then 1, then 309, then the number: +1 309 555-0123.

Source: NANPA numbering plan. An area code covers a region, not a precise address — a 309 number does not pinpoint a street or ZIP code.

Number holders in area code 309

Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 800 prefixes are in use in 309, shared by 77 companies. The largest holders:

CompanyPrefixesShare
Frontier North, Inc.9912%
Illinois Bell Tel Co8310%
Onvoy, LLC739%
Level 3 Communications, LLC668%
Cellco Partnership Dba Verizon Wireless466%
Mediacom Telephony Of Illinois, LLC395%

Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.

Complaints about 309 numbers

Reports to the FTC, last 30 days
501
Recorded messages or robocalls
75%
Rank among area codes
#205 of 670
Most reported subjects
Other (224)
Reducing your debt (credit cards, mortgage, student loans) (135)
Calls pretending to be government, businesses, or family and friends (42)

Period Aug 26 – Sep 24, 2026. These are the numbers shown on the caller ID of the reported calls; many are spoofed and do not belong to the real caller.

Source: US Federal Trade Commission, Do Not Call reported calls data (daily files).

All US area codes United States +1 Map of area code 309 — cities & rate centres

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