🇺🇸 983 area code
Area code 983 covers Denver, Aurora, Boulder and Littleton and the surrounding area in Colorado. It shares that territory with 303 and 720, so the same neighbourhood can have numbers in any of them. Enter a 983 number below for a free check before you call back.
- Location: Denver, Colorado
- Time zone: Mountain (UTC−7)
- In service since June 17, 2022
Look up a number
Validity, carrier, line type, and region on the first pass.
Area code 983 at a glance
Cities in the 983 overlay area
- Denver
- Aurora
- Boulder
- Littleton
- Broomfield
- Golden
- Longmont
- Highlands Ranch
- Brighton
- Parker
Is a 983 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so a 983 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing a 983 number to people in Colorado because a local-looking call is more likely to be answered. If a 983 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 983
983 entered service on June 17, 2022, as an overlay on 303, which had run short of numbers.
It is part of the 303/720/983 overlay: the codes cover the same area, and a new line there can be given a number in any of them. Two neighbours — or two phones in one household — can have different area codes. That is also why local calls need the full ten digits.
Because 983 overlays the same ground, the cities listed are those of the codes it shares with.
Area codes
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FAQ
Area code 983 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 983?
Area code 983 is in Colorado, United States. It covers Denver, Aurora, Boulder, Littleton, Broomfield and Golden.
What time zone is area code 983?
983 is in the Mountain (UTC−7) time zone, and observes daylight saving time.
What area codes overlay 983?
303 and 720 serve the same area as 983. Numbers in all of them are local to one another.
When did area code 983 start?
983 entered service on June 17, 2022, created from 303.
How do I find out who called me from 983?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 983?
If you live in or near Colorado, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 983 callers who will not leave a message are best looked up before you call back.
Got a call from 983?
Run the free check first — validity, carrier, line type and region — and unlock the full report only if you need it.