Area code 970: where it is and who calls from it
Area code 970 is in Colorado.
Colorado (Grand Junction, Aspen, Durango, Estes Park, Fort Collins, Frisco, Glenwood Springs, Greeley, Purgatory, Steamboat Springs, Telluride, Vail, Rocky Mountain National Park, Dinosaur National Monument, and most of north-central, south-central, and western Colorado)
| Where | Colorado |
|---|---|
| Time zone | Mountain Time ยท local time |
| In service since | 1995 |
| Overlay | Yes, with 748 |
| Prefixes assigned | 775 of 792 possible (98%) |
Overlay: 970 covers the same area as 748. Overlay areas use 10-digit dialing, so a seven-digit number alone won't connect, and neighbors can have different area codes.
Where 970 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 970, with how many prefixes each has.
Plus 59 smaller rate centers.
Who holds 970 numbers
- Mobile carrier 28%
- Local phone company 31%
- Internet / business phone carrier 33%
- Phone company 8%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| CenturyLink / Lumen | Local phone company | 218 | 28% |
| Onvoy | Internet / business phone carrier | 92 | 12% |
| Verizon Wireless | Mobile carrier | 77 | 10% |
| T-Mobile (including Sprint) | Mobile carrier | 70 | 9% |
| AT&T Mobility | Mobile carrier | 54 | 7% |
| Level 3 (Lumen) | Internet / business phone carrier | 47 | 6% |
| TON80 Communications | Internet / business phone carrier | 22 | 3% |
| Union Telephone | Local phone company | 17 | 2% |
| Bandwidth | Internet / business phone carrier | 16 | 2% |
| Peerless Network Of Colorado | Internet / business phone carrier | 14 | 2% |
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.
States served: Colorado.
Other area codes in Colorado
Got a call from 970?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 970 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.