Phone numbers in Plano, Illinois
Plano has 5 phone prefixes in area codes 331, 630.
Biggest holders: Onvoy, Bandwidth, First Communications. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 20%
- Internet / business phone carrier 60%
- Phone company 20%
Every prefix in Plano
Search the first six digits of a number in this list. If it's here, the number started in Plano with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 331-341 | Onvoy | Internet / business phone carrier | 2021 |
| 331-808 | Bandwidth | Internet / business phone carrier | 2015 |
| 630-273 | First Communications | Phone company | – |
| 630-332 | Windstream (PAETEC) | Internet / business phone carrier | 2009 |
| 630-552 | AT&T (local phone) | Local 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.