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309 Area Code — Scam Calls, Location & Who's Calling

Area code 309 serves Illinois in the Central time zone, in service since 1957. The FCC has 1,612 unwanted-call complaints against 1,292 different 309 numbers on record. Look up the exact number that called you below.

Most-reported 309 numbers

Ranked by FCC unwanted-call complaints. Click a number for its full report.

309 unwanted-call complaints, last 12 months

Monthly FCC complaint volume against 309 numbers. Spikes usually mark an active robocall campaign cycling through the code.

Carriers operating in 309

Carriers assigned to 309 prefixes that visitors have looked up so far — resolved from official NPA-NXX assignment records.

  • LEVEL 3 COMMUNICATIONS, LLC - ILC · 7 prefixes
  • ONVOY, LLCC · 6 prefixes
  • FRONTIER NORTH, INC. - ILI · 4 prefixes
  • ILLINOIS BELL TEL COI · 3 prefixes
  • T-MOBILE USA, INC.Wireless · 2 prefixes
  • PAETEC ITEL, LLCC · 2 prefixes
  • HD CARRIER LLCC · 1 prefix
  • CELLCO PARTNERSHIP DBA VERIZON WIRELESS - ILWireless · 1 prefix

About area code 309

Serves
Illinois
Time zone
Central
In service since
1957-01-01
Overlay
Yes — 10-digit dialing

Source: NANPA numbering records, refreshed weekly.

Spam calls from 309? What to know

Seeing repeated missed calls from 309 numbers you don't recognize is the classic signature of neighbor-spoofing robocall campaigns. The caller isn't necessarily in Illinois — spoofing software displays whatever digits the campaign chooses. Never call unknown numbers back; look them up first, and report unwanted calls to the FCC to build the public record.

Area code 309 FAQs

Where is area code 309?

Area code 309 serves Illinois, in the Central time zone. It is part of an overlay complex, so multiple area codes serve the same territory and 10-digit dialing is required. It has been in service since 1957.

Why do I keep getting calls from 309 numbers?

Robocallers use "neighbor spoofing" — displaying a number with a local area code to make you more likely to answer. A call showing area code 309 may not originate from Illinois at all. Look up the full 10-digit number on this site to see its complaint history before calling back.

Are 309 numbers safe to call back?

Area codes themselves are neither safe nor unsafe — 309 contains millions of legitimate lines alongside any spoofed or spam numbers. The FCC has logged 1,612 unwanted-call complaints against 1,292 distinct 309 numbers in our current data window. Check the specific number's report page before returning a missed call.