Area code
983
983 is a United States area code. Under the North American Numbering Plan it belongs to Colorado, which has 6 area codes in total.
Validate a number in 983
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
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Area code 983 at a glance
NANPA lists 42 central office codes (prefixes) in use in area code 983, held by 18 holders across 6 rate centers.
| Fact | Value |
|---|---|
| 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 in area code 983
The largest rate center is DENVER, with 29 prefixes (69%).
| Rate center | Prefixes | Share |
|---|---|---|
| DENVER | 29 | 69% |
| LONGMONT | 6 | 14% |
| FORTLUPTON | 3 | 7% |
| STRASBURG | 2 | 5% |
| DECKERS | 1 | 2% |
| ROGGEN | 1 | 2% |
Who holds the prefixes in 983
Onvoy holds the most prefixes, 9 (21%). 93% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| 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. Find which carrier a number is on, or browse the prefix holders.
History of area code 983
- 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.
Area codes nearest to 983
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
Overlay codes in the same area
ZIP codes in area code 983
73 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Denver, CO | 66 |
| Longmont, CO | 4 |
| Fort Lupton, CO | 1 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 983 numbers
87 FCC complaints are on file for 77 numbers in 983, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 9 |
| 2024 | 8 |
| 2025 | 17 |
Other area codes in Colorado
Colorado is one state with 6 area codes in the NANPA table. 983 is one of them.
Next to 983 in the numbering table
These are the codes just before and after 983 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 983 was first assigned in Colorado. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in Colorado next to a 983 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 983
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.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.