Phone numbers in Delta, Colorado
Delta has 6 phone prefixes in area code 970.
Biggest holders: Onvoy, Fasttrack Communications, Bandwidth. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 33%
- Internet / business phone carrier 50%
- Phone company 17%
Every prefix in Delta
Search the first six digits of a number in this list. If it's here, the number started in Delta with the carrier shown. If it isn't, check the Colorado page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 970-399 | Fasttrack Communications | Phone company | – |
| 970-540 | Onvoy | Internet / business phone carrier | 2005 |
| 970-546 | Bandwidth | Internet / business phone carrier | 2016 |
| 970-751 | Union Telephone | Local phone company | 2012 |
| 970-808 | Onvoy | Internet / business phone carrier | 2011 |
| 970-874 | CenturyLink / Lumen | 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.