Area code 983
Where 983 is, how it is dialed, which carriers hold its numbers and how many of its codes are in use, from NANPA's 10/01/2026 files.
- State
- CO
- In service
- 2022
- Assigned codes
- 46of 800 possible
- Carriers
- 19
Area code 983 at a glance
NANPA lists 983 as an in-service geographic area code for Colorado, first put into service on June 17, 2022. It is an overlay: 983 and 303 and 720 cover the same territory, so neighbors on the same street can have different area codes. It is in the Mountain time zone. The places with the most assigned exchanges include Denver, Longmont, and Fort Lupton.
| Item | Value |
|---|---|
| State | Colorado |
| In service since | June 17, 2022 |
| Assigned by NANPA | May 27, 2021 |
| Overlay | Yes, with 303, 720 |
| Parent area code (NANPA) | 303 |
| Time zone | Mountain |
| Local calls within the code | ten digits (area code plus number) |
| Assigned central office codes | 46 |
| Rate centers with codes | 6 |
| Carriers holding codes | 19 |
| Pooled codes | 43 |
| Codes assigned since 2020 | 46 |
| Relief planning in progress | No |
Source: NANPA NPA report and utilized central office code file, both dated 10/01/2026.
Places served by 983
983 holds 1.5% of the 3,055 central office codes assigned in Colorado, the 5th most of the state's 6 codes. 3 Census places could be matched to rate centers with 983 exchanges; the most populous are Denver (729,000), Longmont (99,818), and Fort Lupton (9,948). For a storefront or service area inside 983, the place pages show which prefixes are rated local there.
| Place | Population (2024) | Area codes | Exchanges | Carriers |
|---|---|---|---|---|
| Denver, CO | 729,019 | 303, 720, 983 | 1,445 | 62 |
| Longmont, CO | 99,818 | 303, 720, 983 | 64 | 14 |
| Fort Lupton, CO | 9,948 | 303, 720, 983 | 28 | 8 |
Population: Census Vintage 2024 estimates for the matched place. Exchanges and carriers: NANPA utilized code file.
Ten-digit and seven-digit dialing in 983
According to NANPA's dialing-plan data, local calls within 983 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits. Ten-digit local dialing means the area code is part of how customers save and recognize your number, so print it in full everywhere. NANPA's dialing-plan note for this code reads: "1+10 permissible at service providers discretion"
Carriers with 983 numbers
19 carriers hold the 46 central office codes assigned in 983. Onvoy, LLC - CO has the most, with 11 (24%). 43 of the codes (93%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. Numbers can move between carriers through porting, so a code's holder tells you where the block started, not where every number lives now.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| Onvoy, LLC - CO | 11 | 24% |
| Wide Voice, LLC - CO | 7 | 15% |
| New Cingular Wireless PCS, LLC | 4 | 8.7% |
| Shelcomm | 3 | 6.5% |
| Cellco Partnership d/b/a Verizon Wireless - CO | 3 | 6.5% |
| Teleport Communications America, LLC - CO | 2 | 4.3% |
| Onvoy Spectrum, LLC | 2 | 4.3% |
| Ahoi LLC | 2 | 4.3% |
| Opentact INC. | 2 | 4.3% |
| Nuso, LLC | 1 | 2.2% |
| T-mobile USA, INC. | 1 | 2.2% |
| Bandwidth.com CLEC, LLC - CO | 1 | 2.2% |
Carrier names are the operating company (OCN) names on NANPA's utilized central office code file dated 10/01/2026. A carrier holding a code may port numbers to other carriers.
Local calling areas in 983
NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 983 has codes in 6 rate centers. The table lists the rate centers with the most codes, with the matching Census place where the abbreviation could be matched.
| Rate center (NANPA) | Place | Codes |
|---|---|---|
| DENVER | Denver, CO | 32 |
| LONGMONT | Longmont, CO | 7 |
| FORTLUPTON | Fort Lupton, CO | 3 |
| STRASBURG | not matched | 2 |
| DECKERS | not matched | 1 |
| ROGGEN | not matched | 1 |
How full is area code 983?
An area code has 800 possible central office codes that start with 2 through 9, a few of which are reserved (such as N11 service codes and 555). 46 are assigned in 983, 5.8% of 800. 46 were assigned in 2020 or later.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2020s | 46 | 100% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
A local 983 number on Callata
For $99 a month, Callata puts a team of up to 5 on one plan ($20 for each person after that): up to 3 local numbers, unlimited inbound calls, a pooled allowance of 1,500 outbound US and Canada minutes per user, browser and cell calling, voicemail transcription with urgency triage, recorded calls with AI summaries and business-hours routing, with E911 on every number.
If you already have a number in area code 983, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.
Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.
Frequently asked questions
Where is area code 983?
983 is a geographic area code in Colorado. Places with the most assigned exchanges include Denver, Longmont, and Fort Lupton.
What time zone is area code 983 in?
NANPA lists 983 in the Mountain time zone.
When did area code 983 go into service?
NANPA records an in-service date of June 17, 2022. The code was assigned on May 27, 2021.
Is 983 an overlay area code?
Yes. It shares its territory with 303 and 720.
Can my business get a 983 phone number?
Callata includes up to 3 local numbers on its $99/month plan (5 users included). Which 983 numbers are open depends on carrier inventory when you choose, and you can port an existing number for free.