983 area code — Denver, CO geographic
If a call shows area code 983, the number was issued in the Denver area — a code active since 2022, on Mountain time. The same territory is also served by its overlay codes (303/720/983 complex). Keep in mind the code identifies where the number was registered; the person calling may be elsewhere.
The code currently holds 38 working prefixes, held by 17 different carriers. Of these, 35 are pooled prefixes shared by multiple carriers. Numbers are anchored to 6 rate centers — billing localities that fix where each prefix belongs.
The current NANPA exhaust forecast for the 303/720/983 complex is 2Q 2069.
The code was carved out of 303 (2022).
Local calls inside 983 are dialed 10D; 1+10 permissible at service providers discretion.
If a 983 call asks for money or personal data, treat the displayed number as unverified: hang up and reach the organization through its published number. Numbering data locates numbers, not callers.
Largest localities in 983
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| Denver | 25 | 303, 720 |
| Longmont | 6 | 303, 720 |
| Fort Lupton | 3 | 303, 720 |
| Strasburg | 2 | 303, 720 |
| Deckers | 1 | 303, 720 |
| Roggen | 1 | 303 |
FAQ
Is 983 a toll-free number?
No. 983 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.
Why do 303 and 983 cover the same place?
They are overlays: when a code runs low on numbers, a new code is added over the same territory instead of splitting it. The 303/720/983 complex shares one service area, and local calls are dialed with 10 digits.
Will 983 run out of numbers?
NANPA's current forecast projects exhaust in 2Q 2069 — decades of capacity remain.