Phone numbers in Windsor, Colorado
Windsor has 10 phone prefixes in area code 970.
Biggest holders: AT&T Mobility, Comcast, CenturyLink / Lumen. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 20%
- Local phone company 20%
- Internet / business phone carrier 50%
- Phone company 10%
Every prefix in Windsor
Search the first six digits of a number in this list. If it's here, the number started in Windsor with the carrier shown. If it isn't, check the Colorado page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 970-303 | Onvoy | Internet / business phone carrier | 2025 |
| 970-388 | AT&T Mobility | Mobile carrier | 2001 |
| 970-460 | Comcast | Internet / business phone carrier | 2006 |
| 970-545 | AT&T Mobility | Mobile carrier | 2001 |
| 970-561 | Comcast | Internet / business phone carrier | 2019 |
| 970-600 | Telstar Communications | Phone company | 2010 |
| 970-674 | CenturyLink / Lumen | Local phone company | – |
| 970-686 | CenturyLink / Lumen | Local phone company | – |
| 970-795 | Bandwidth | Internet / business phone carrier | – |
| 970-833 | MCImetro (Verizon Business) | Internet / business phone carrier | 2013 |
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.