Where is the 983 area code?

Area code 983 covers Colorado, on Mountain Time.

What time zone is area code 983 in?

Numbers in the 983 area code sit in Mountain Time.

Is 983 a toll-free or scam area code?

No. 983 is a geographic North American Numbering Plan area code assigned to Colorado. Toll-free numbers use 800, 833, 844, 855, 866, 877 and 888. A call from 983 can still be spoofed, so treat unexpected calls with the usual caution.

Area code lookup

983 area code

Where the 983 area code is, which cities and counties it serves, the local time zone and the overlay codes dialled alongside it.

State: CO
Codes in state: 5
Overlays & neighbours: 4
Time zone: Mountain Time

Quick answer

Area code 983 is a geographic area code assigned to Colorado under the North American Numbering Plan. Colorado observes Mountain Time, and the state also holds 4 other area codes: 303, 719, 720, 970.

Largest cities in Colorado

The largest places in Colorado. Each links to its full local profile: population, income, housing and sales tax.

City	Population
Denver city	713,734
Colorado Springs city	483,099
Aurora city	390,201
Fort Collins city	169,705
Lakewood city	156,309
Thornton city	142,878
Arvada city	122,835
Westminster city	115,546
Pueblo city	111,514
Greeley city	109,421
Centennial city	107,386
Boulder city	106,274

All Colorado cities All Colorado ZIP codes Colorado sales tax

Related area codes

Codes that share or border the same calling area.

983 area code FAQ

The questions people ask about this code.

Where is area code 983?

983 is a geographic area code in Colorado.

What time is it in the 983 area code?

983 observes Mountain Time.

Is 983 a scam area code?

No — it is a normal geographic code, not a toll-free or premium-rate prefix. Caller ID can be spoofed on any code, so verify unexpected callers before sharing information.

Sources & transparency

North American Numbering Plan Administrator (NANPA) area code assignments — area code to geography mapping and overlay relationships
US Census Bureau, American Community Survey 2019-2023 5-year estimates — city, county and ZIP code geography

Last reviewed August 2026. Figures are published for reference and can change; verify with the source agency before filing or contracting. How we build and check this data.