Area code 983 – Colorado
983 has served Colorado since 2022, split from 303. It is still largely empty: 48 of 786 number blocks allocated. Other CLEC / VoIP is the largest holder with 45.8% of blocks, ahead of Onvoy / Inteliquent at 27.1%. It shares its geography with overlay codes 303, 720, so local calls take all ten digits. Spam complaints are comparatively rare: 145 in the 33 days to 30 October 2026, 360th of the 422 codes with five or more complaints.
- State
- Colorado
- In service since
- 2022
- Time zone
- Mountain
Who holds 983 number blocks
Share of the 48 assigned NXX blocks (6.1% of the 786 possible), across 19 carriers. This is share of number blocks, not of subscribers.
- Other CLEC / VoIP39.6%
- Onvoy27.1%
- AT&T12.5%
- Verizon6.2%
- Charter4.2%
- T-Mobile2.1%
- Bandwidth2.1%
- TPx2.1%
- VoIP Innovations2.1%
- 8x82.1%
Spam complaints naming 983
FTC Do Not Call complaints where the caller ID was a 983 number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are frequently spoofed, so these are complaints about the code, not calls proven to originate in it.
Rate centers in 983
NANPA allocates number blocks to rate centers and records their names abbreviated to ten characters, so these are NANPA's codes rather than place names – CHAMPAURBN is Champaign-Urbana, NWYRCYZN01 is a New York City zone. We show them unchanged instead of guessing at the full names. Showing the largest 5 of 7.
Timeline
- 2022 983 goes into service, split from or overlaid on 303.
More about 983
Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.
Frequently asked about 983
What state is area code 983?
Colorado. It covers the same area as 303/720/983.
Is a call from 983 a scam?
Not by itself. 983 drew 145 FTC complaints in the 33 days to 30 October 2026, 360th of 422 ranked codes – mid-pack or lower. Spam callers spoof caller IDs, so the only useful check is the full number.
Which carrier owns 983 numbers?
Other CLEC / VoIP holds the largest share of assigned number blocks at 45.8%. The rest is spread across 3 other carriers. This is share of number blocks, not of subscribers – people keep their numbers when they switch carriers.
Do I need to dial 10 digits in 983?
Yes – ten digits for local calls in 983, because it shares its area with another code.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 25 daily files 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
NANPA dialing note for this code: “10D”. Reviewed by the data desk. Spotted an error? Request a correction.