CallataGuides

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.

Area code 983: NANPA facts
ItemValue
StateColorado
In service sinceJune 17, 2022
Assigned by NANPAMay 27, 2021
OverlayYes, with 303, 720
Parent area code (NANPA)303
Time zoneMountain
Local calls within the codeten digits (area code plus number)
Assigned central office codes46
Rate centers with codes6
Carriers holding codes19
Pooled codes43
Codes assigned since 202046
Relief planning in progressNo

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.

Most populous places with 983 exchanges
PlacePopulation (2024)Area codesExchangesCarriers
Denver, CO729,019303, 720, 9831,44562
Longmont, CO99,818303, 720, 9836414
Fort Lupton, CO9,948303, 720, 983288

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.

Largest code holders in area code 983
Carrier (NANPA operating company)ExchangesShare
Onvoy, LLC - CO1124%
Wide Voice, LLC - CO715%
New Cingular Wireless PCS, LLC48.7%
Shelcomm36.5%
Cellco Partnership d/b/a Verizon Wireless - CO36.5%
Teleport Communications America, LLC - CO24.3%
Onvoy Spectrum, LLC24.3%
Ahoi LLC24.3%
Opentact INC.24.3%
Nuso, LLC12.2%
T-mobile USA, INC.12.2%
Bandwidth.com CLEC, LLC - CO12.2%

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 centers in area code 983 by assigned codes
Rate center (NANPA)PlaceCodes
DENVERDenver, CO32
LONGMONTLongmont, CO7
FORTLUPTONFort Lupton, CO3
STRASBURGnot matched2
DECKERSnot matched1
ROGGENnot matched1

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.

Area code 983: central office codes by decade assigned
Decade assignedExchangesShare
2020s46100%

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.