983
Area code
CO
United States geographic area code, in service since 2022-06-17. Part of the 303/720/983 overlay complex — ten-digit dialing required.
Statusin service
Introduced2022-06-17
JurisdictionCO, US
Local dialing10D
Time zoneMountain
Last verified2026-09-17
Utilization 7.4% of assignable prefixes assigned
As of 09/17/2026
0%59 of ~792 assignable NXX values (200–999 excl. N11)100%
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2023-03-29, most recent 2026-09-11.
Area codes serve rate-center geographies, not municipal boundaries. “CO” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | ONVOY, LLC - CO | 11 | 18.6% |
| 02 | MULTIPLE OCN LISTING | 9 | 15.3% |
| 03 | WIDE VOICE, LLC - CO | 7 | 11.9% |
| 04 | 5 | 8.5% | |
| 05 | NEW CINGULAR WIRELESS PCS, LLC | 4 | 6.8% |
| 06 | SHELCOMM | 3 | 5.1% |
| 07 | TELEPORT COMMUNICATIONS AMERICA, LLC - CO | 2 | 3.4% |
| 08 | OPENTACT INC. | 2 | 3.4% |
| 09 | ONVOY SPECTRUM, LLC | 2 | 3.4% |
| 10 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO | 2 | 3.4% |
Important: these are initial assignees from NANPA CO-code records — the carrier a prefix was originally assigned to. Because of number portability, the current serving carrier of any individual number may differ.
Change history
Recorded events for this NPA- 2021-07-29 NPA 983 to Overlay NPA 303/720 (Colorado)
- 2022-06-17Area code 983 entered service (created from 303).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2021-07-29 | PL-563 ↗ | NPA 983 to Overlay NPA 303/720 (Colorado) |