---
title: "Area code 983: Colorado, United States"
url: "https://lookvalid.com/area-code/983.md"
canonical_url: "https://lookvalid.com/area-code/983"
last_updated: "2026-10-23"
type: "reference"
summary: "Area code 983 serves Colorado, United States. Number formats, numbering rules, a live phone validator and the other codes in Colorado."
---

# Area code 983: Colorado, United States

Area code 983 serves Colorado, United States. Number formats, numbering rules, a live phone validator and the other codes in Colorado.

NANPA lists 42 central office codes (prefixes) in use in area code 983, held by 18 holders across 6 rate centers.
The largest rate center is DENVER, with 29 prefixes (69%).
Onvoy holds the most prefixes, 9 (21%). 93% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
The FCC unwanted-call data has 87 complaints on file for 77 numbers in 983, most often filed as "Unwanted Calls". These are consumer reports, not findings.

## Facts

- In service since: 2022-06-17
- Time zone: Mountain (M)
- Assigned overlays: 303 (1947-01-01), 720 (1998-06-01)
- Prefixes in use: 42
- Pooled prefixes: 39 (93%)
- Rate centers: 6
- Companies holding prefixes: 18
- Assignment dates on file: 2023-03-29 to 2026-06-16 (42 prefixes)
- ZIP codes in its places: 73

## Rate centers

| Rate center | Prefixes | Share |
| --- | --- | --- |
| DENVER | 29 | 69% |
| LONGMONT | 6 | 14% |
| FORTLUPTON | 3 | 7% |
| STRASBURG | 2 | 5% |
| DECKERS | 1 | 2% |
| ROGGEN | 1 | 2% |

## Carriers

| Holder | Prefixes | Share |
| --- | --- | --- |
| Onvoy | 9 | 21% |
| Wide Voice | 7 | 17% |
| New Cingular Wireless PCS | 4 | 10% |
| Shelcomm | 3 | 7% |
| Ahoi | 2 | 5% |
| Onvoy Spectrum | 2 | 5% |
| 12 other carriers | 15 | 36% |

A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company.

## History

- 1947-01-01: Area code 303, named as the parent of 983 in the NANPA report, was in service.
- 2022-06-17: Area code 983 went into service.

## Nearest area codes

The area codes closest to 983, measured between the centers of the ZIP code places they serve, are 970 (about 60 miles), 719 (about 111 miles), 307 (about 235 miles), 308 (about 255 miles) and 505 (about 297 miles).

## ZIP codes

73 ZIP codes fall in places that have a rate center in this area code. The places with the most are Denver, CO (66 ZIP codes), Longmont, CO (4 ZIP codes) and Fort Lupton, CO (1 ZIP code). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes.

## Complaints on file

87 complaints for 77 numbers. Numbers whose latest complaint falls in each year:

- 2023: 9
- 2024: 8
- 2025: 17

## Questions

### Where is area code 983?

NANPA assigns area code 983 to Colorado, United States.

### In which state does area code 983 sit?

Colorado. 983 is one of 6 area codes the NANPA table assigns to the state.

### Which places does area code 983 cover?

The places with the most ZIP codes among the rate centers in 983 are Denver, CO, Longmont, CO and Fort Lupton, CO. The rate center list on this page shows all of them.

### Who owns area code 983?

NANPA assigns area codes. Within 983, Onvoy holds the most prefixes, 9 prefixes or 21%.

### Which time zone does 983 use?

The NANPA NPA report lists the time zone for 983 as Mountain (M).

### What year did 983 enter service?

The NANPA NPA report gives an in-service date of 2022-06-17, so 983 has been in use since 2022.

### Does area code 983 have an overlay?

Yes. 303 (in service 1947-01-01) and 720 (in service 1998-06-01) share the same area with 983, so numbers from all of them are local to each other.

### Which area codes are nearest to 983?

The area codes closest to 983, measured between the centers of the ZIP code places they serve, are 970 (about 60 miles), 719 (about 111 miles), 307 (about 235 miles), 308 (about 255 miles) and 505 (about 297 miles).

### How many prefixes does area code 983 have?

NANPA's report dated 2026-10-17 lists 42 prefixes in service in 983, spread over 6 rate centers and 18 holders.

### Are there complaints about 983 numbers?

The FCC data on file has 87 complaints for 77 numbers in 983. They are unverified consumer reports. A number with no complaints on file is not proven safe.

Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).