Area code 983: where it is and who calls from it
Area code 983 is in Colorado.
Denver, Colorado
| Where | Colorado |
|---|---|
| Time zone | Mountain Time ยท local time |
| In service since | 2022 |
| Overlay | Yes, with 303, 720 |
| Prefixes assigned | 47 of 792 possible (6%) |
Overlay: 983 covers the same area as 303, 720. Overlay areas use 10-digit dialing, so a seven-digit number alone won't connect, and neighbors can have different area codes.
Where 983 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 983, with how many prefixes each has.
Who holds 983 numbers
- Mobile carrier 17%
- Internet / business phone carrier 45%
- Phone company 38%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| Onvoy | Internet / business phone carrier | 14 | 30% |
| Wide Voice | Phone company | 7 | 15% |
| AT&T Mobility | Mobile carrier | 4 | 9% |
| Shelcomm | Phone company | 3 | 6% |
| Verizon Wireless | Mobile carrier | 3 | 6% |
| Teleport Communications America | Internet / business phone carrier | 2 | 4% |
| Ahoi | Phone company | 2 | 4% |
| Opentact | Phone company | 2 | 4% |
| Nuso | Internet / business phone carrier | 1 | 2% |
| T-Mobile (including Sprint) | Mobile carrier | 1 | 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 983?
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 983 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.