Phone numbers in Green Valley, Illinois
Green Valley has 3 phone prefixes in area code 309.
Biggest holders: Brightspeed Of Illinois, Onvoy, Mediacom Telephony Of Illinois. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 33%
- Internet / business phone carrier 67%
Every prefix in Green Valley
Search the first six digits of a number in this list. If it's here, the number started in Green Valley with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 309-352 | Brightspeed Of Illinois | Local phone company | – |
| 309-956 | Onvoy | Internet / business phone carrier | 2024 |
| 309-977 | Mediacom Telephony Of Illinois | Internet / business phone carrier | – |
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.