Phone numbers in Greenriver, Illinois
Greenriver has 3 phone prefixes in area code 309.
Biggest holders: Geneseo Tel, Mediacom Telephony Of Illinois. This is the local calling area (rate center) where those prefixes were first assigned.
- Internet / business phone carrier 33%
- Phone company 67%
Every prefix in Greenriver
Search the first six digits of a number in this list. If it's here, the number started in Greenriver with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 309-441 | Geneseo Tel | Phone company | – |
| 309-933 | Mediacom Telephony Of Illinois | Internet / business phone carrier | 2006 |
| 309-949 | Geneseo Tel | Phone company | – |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.