Area code 309 – Illinois
309 has served Illinois since 1957. All but a handful of its 786 number blocks are allocated (786 of 786), so it is effectively exhausted. No carrier dominates: Frontier 18.2%, AT&T 17.2%, Other CLEC / VoIP 17.0%. It shares its geography with overlay codes 861, so local calls take all ten digits. Spam complaints are comparatively rare: 322 in the 33 days to 30 October 2026, 290th of the 422 codes with five or more complaints. Numbers are spread across 171 rate centers, which is typical of a mostly rural code.
Who holds 309 number blocks
Share of the 786 assigned NXX blocks (100% of the 786 possible), across 71 carriers. This is share of number blocks, not of subscribers.
- Other CLEC / VoIP23.5%
- Frontier18.2%
- AT&T17.2%
- Onvoy9.4%
- Lumen9.2%
- Verizon7.4%
- T-Mobile5.1%
- Brightspeed3.1%
- Bandwidth1.3%
- Charter1%
- Comcast1%
- Telnyx0.9%
- Windstream0.8%
- Twilio0.5%
- Peerless0.4%
- Vonage0.4%
- Dish0.3%
- Consolidated0.1%
- American Messaging0.1%
- Spok0.1%
- VoIP Innovations0.1%
Spam complaints naming 309
FTC Do Not Call complaints where the caller ID was a 309 number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are frequently spoofed, so these are complaints about the code, not calls proven to originate in it.
Rate centers in 309
NANPA allocates number blocks to rate centers and records their names abbreviated to ten characters, so these are NANPA's codes rather than place names – CHAMPAURBN is Champaign-Urbana, NWYRCYZN01 is a New York City zone. We show them unchanged instead of guessing at the full names. Showing the largest 5 of 171.
Timeline
- 1957 309 goes into service in Illinois.
More about 309
Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.
Frequently asked about 309
What state is area code 309?
Illinois. It covers the same area as 309/861.
Can I still get a 309 number?
Only from recycled stock. 786 of the 786 available blocks are already allocated, so new numbers in the area normally come from the overlay codes (309/861).
Is a call from 309 a scam?
Not by itself. 309 drew 322 FTC complaints in the 33 days to 30 October 2026, 290th of 422 ranked codes – mid-pack or lower. Spam callers spoof caller IDs, so the only useful check is the full number.
Which carrier owns 309 numbers?
Frontier holds the largest share of assigned number blocks at 18.2%. The rest is spread across 3 other carriers. This is share of number blocks, not of subscribers – people keep their numbers when they switch carriers.
Do I need to dial 10 digits in 309?
Yes – ten digits for local calls in 309, because it shares its area with another code.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 25 daily files 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
NANPA dialing note for this code: “10D”. Reviewed by the data desk. Spotted an error? Request a correction.