North American Numbers Source-cited · ownership disclosed
Area code
983
In service
United States · since 2022

Denver (overlay)

Area code 983 is the newest overlay in the Denver-metro 303/720/983 complex, activated June 17, 2022, after the Denver area was projected to exhaust available numbers by 2023.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Denver (overlay)
Type
geographic
Status
in service
In service since
2022
Projected exhaust
2069 Q2

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 983 is

North-central Colorado: Denver, Boulder and surrounding Front Range suburbs..

Communities served wholly or partly by 983:

DenverBoulderAuroraLakewoodLittletonLongmontBroomfieldCastle Rock

Same geography as 303 and 720; the three-code overlay yields ~23.8 million numbers for an area of about 3.5 million people.

B · Relationships

How it relates to other codes

The codes 983 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Overlay · 2022 303 Denver Overlays the original 303 Denver-Boulder area.
Overlay · 2022 720 Denver (overlay) Same geography; second code in the Denver-metro complex.
What's changing. Overlay — third and newest code of the 303/720/983 Denver-metro overlay complex.
C · History

How 983 got here

2021-05-21
Colorado PUC approved area code 983 as a third overlay.
Source: Wikipedia
2022-06-17
Activated as an overlay of the 303/720 complex; added after projected 2023 exhaustion.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
59
Prefixes available
741
Thousands-blocks assigned
375

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 983 with another code →
Sources
Wikipedia ↗
Area code 983
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.