983 Area CodeDenver, CO
Area code 983 covers Denver and nearby communities in Colorado, in the Mountain Time (MT) zone, home to about 3,380,487 people across 137 cities. It was added in 2022 as an overlay of 303, so the same region uses several codes and every local call needs all ten digits.
Overview
- Major City
- Denver
- State
- Colorado (CO)
- Timezone
- Mountain Time (MT)
- Current Time
- –:––
- Overlay
- Yes – shares area with 303, 720
Overview of the 983 Area Code
What is the 983 area code?
The 983 area code serves Denver, Colorado, alongside other established area codes. When you see a 983 number, it indicates a local number within this geographic area.
Why was area code 983 created?
Area code 983 went into service on June 17, 2022, as an overlay of 303. An overlay adds a second code to the same territory instead of splitting it: existing 303 numbers kept their digits, new lines began receiving 983 numbers, and local calls in the region require all ten digits. The same territory also carries 720.
Geographic Coverage of the 983 Area Code
The 983 area code serves Denver and surrounding areas in Colorado. It operates within the Mountain Time (MT) time zone. It complements the coverage of area codes 303 and 720. This area code covers several key cities, including:
- Denver
- Aurora
- Lakewood
- Thornton
- Arvada
- Westminster
Got a call from a 983 number? It came from Denver, CO. Since 983 overlays with 303 and 720, every local call in the region needs all ten digits to land on the right line. Of the listed cities' population, Denver accounts for about 23.0%; the rest is split across 136 smaller cities.
Denver Area Codes Overview
Denver is served by multiple area codes, reflecting its telecommunications needs. The 983 area code operates alongside 303, 720. Here are the area codes serving this region:
The introduction of the 983 area code helped prevent number exhaustion, ensuring a continuous supply of phone numbers across the geographic area.
What cities does area code 983 cover?
| City | State | Population | Population in 983 | % of listed-city population | % of City |
|---|---|---|---|---|---|
| Denver | CO | 729,019 | 729,019 | 23.0% | 100.0% |
| Aurora | CO | 403,130 | 403,130 | 12.7% | 100.0% |
| Lakewood | CO | 156,868 | 156,868 | 5.0% | 100.0% |
| Thornton | CO | 146,689 | 146,689 | 4.6% | 100.0% |
| Arvada | CO | 121,873 | 121,873 | 3.8% | 100.0% |
| Westminster | CO | 115,302 | 115,302 | 3.6% | 100.0% |
| Centennial | CO | 108,853 | 108,853 | 3.4% | 100.0% |
| Boulder | CO | 106,803 | 106,803 | 3.4% | 100.0% |
| Longmont | CO | 99,818 | 99,818 | 3.2% | 100.0% |
| Highlands Ranch | CO | 96,713 | 96,713 | 3.1% | 100.0% |
| Castle Rock | CO | 83,213 | 83,213 | 2.6% | 100.0% |
| Broomfield | CO | 78,323 | 78,323 | 2.5% | 100.0% |
| Commerce City | CO | 70,245 | 70,245 | 2.2% | 100.0% |
| Parker | CO | 65,473 | 65,473 | 2.1% | 100.0% |
| Littleton | CO | 44,879 | 44,879 | 1.4% | 100.0% |
| Brighton | CO | 43,473 | 43,473 | 1.4% | 100.0% |
| Erie | CO | 38,594 | 38,594 | 1.2% | 100.0% |
| Northglenn | CO | 38,287 | 38,287 | 1.2% | 100.0% |
| Englewood | CO | 35,238 | 35,238 | 1.1% | 100.0% |
| Ken Caryl | CO | 32,438 | 32,438 | 1.0% | 100.0% |
| Dakota Ridge | CO | 32,005 | 32,005 | 1.0% | 100.0% |
| Wheat Ridge | CO | 31,999 | 31,999 | 1.0% | 100.0% |
| Lafayette | CO | 30,587 | 30,587 | 1.0% | 100.0% |
| Columbine | CO | 24,280 | 24,280 | 0.8% | 100.0% |
| Louisville | CO | 20,811 | 20,811 | 0.7% | 100.0% |
| Golden | CO | 20,151 | 20,151 | 0.6% | 100.0% |
| Firestone | CO | 19,396 | 19,396 | 0.6% | 100.0% |
| Sherrelwood | CO | 18,287 | 18,287 | 0.6% | 100.0% |
| Frederick | CO | 17,937 | 17,937 | 0.6% | 100.0% |
| Greenwood Village | CO | 15,288 | 15,288 | 0.5% | 100.0% |
| Castle Pines | CO | 15,162 | 15,162 | 0.5% | 100.0% |
| Welby | CO | 14,846 | 14,846 | 0.5% | 100.0% |
| Lone Tree | CO | 14,061 | 14,061 | 0.5% | 100.0% |
| Federal Heights | CO | 13,971 | 13,971 | 0.4% | 100.0% |
| Superior | CO | 13,654 | 13,654 | 0.4% | 100.0% |
| Berkley | CO | 11,207 | 11,207 | 0.4% | 100.0% |
| Cherry Creek | CO | 11,120 | 11,120 | 0.4% | 100.0% |
| The Pinery | CO | 10,517 | 10,517 | 0.3% | 100.0% |
| Castle Pines North | CO | 10,360 | 10,360 | 0.3% | 100.0% |
| Fort Lupton | CO | 9,948 | 9,948 | 0.3% | 100.0% |
| Gunbarrel | CO | 9,263 | 9,263 | 0.3% | 100.0% |
| Roxborough Park | CO | 9,099 | 9,099 | 0.3% | 100.0% |
| Evergreen | CO | 9,038 | 9,038 | 0.3% | 100.0% |
| Stonegate | CO | 8,962 | 8,962 | 0.3% | 100.0% |
| Lochbuie | CO | 8,599 | 8,599 | 0.3% | 100.0% |
| Derby | CO | 7,685 | 7,685 | 0.3% | 100.0% |
| Fairmount | CO | 7,559 | 7,559 | 0.2% | 100.0% |
| Applewood | CO | 7,160 | 7,160 | 0.2% | 100.0% |
| Dacono | CO | 6,748 | 6,748 | 0.2% | 100.0% |
| Mead | CO | 6,735 | 0 | 0.2% | 0.0% |
| Cherry Hills Village | CO | 6,349 | 6,349 | 0.2% | 100.0% |
| Twin Lakes | CO | 6,101 | 6,101 | 0.2% | 100.0% |
| Sheridan | CO | 5,932 | 5,932 | 0.2% | 100.0% |
| Dove Valley | CO | 5,243 | 5,243 | 0.2% | 100.0% |
| Shaw Heights | CO | 5,116 | 5,116 | 0.2% | 100.0% |
| Edgewater | CO | 4,880 | 4,880 | 0.2% | 100.0% |
| Glendale | CO | 4,465 | 4,465 | 0.1% | 100.0% |
| Glendale | CO | 4,465 | 4,465 | 0.1% | 100.0% |
| Niwot | CO | 4,006 | 4,006 | 0.1% | 100.0% |
| Bennett | CO | 3,916 | 3,916 | 0.1% | 100.0% |
| West Pleasant View | CO | 3,840 | 3,840 | 0.1% | 100.0% |
| Todd Creek | CO | 3,768 | 3,768 | 0.1% | 100.0% |
| Genesee | CO | 3,609 | 3,609 | 0.1% | 100.0% |
| Ponderosa Park | CO | 3,232 | 3,232 | 0.1% | 100.0% |
| Acres Green | CO | 3,007 | 3,007 | 0.1% | 100.0% |
| Meridian | CO | 2,970 | 2,970 | 0.1% | 100.0% |
| Elizabeth | CO | 2,773 | 2,773 | 0.1% | 100.0% |
| Holly Hills | CO | 2,521 | 2,521 | 0.1% | 100.0% |
| Strasburg | CO | 2,447 | 2,447 | 0.1% | 100.0% |
| Lyons | CO | 2,155 | 2,155 | 0.1% | 100.0% |
| Keenesburg | CO | 2,054 | 2,054 | 0.1% | 100.0% |
| Idaho Springs | CO | 1,699 | 1,699 | 0.1% | 100.0% |
| Columbine Valley | CO | 1,683 | 1,683 | 0.1% | 100.0% |
| Perry Park | CO | 1,646 | 1,646 | 0.1% | 100.0% |
| Deer Trail | CO | 1,624 | 1,624 | 0.1% | 100.0% |
| Hudson | CO | 1,617 | 1,617 | 0.1% | 100.0% |
| Inverness | CO | 1,532 | 1,532 | 0.1% | 100.0% |
| Nederland | CO | 1,487 | 1,487 | 0.1% | 100.0% |
| Aristocrat Ranchettes | CO | 1,344 | 1,344 | 0.1% | 100.0% |
| Kittredge | CO | 1,304 | 1,304 | 0.0% | 100.0% |
| Indian Hills | CO | 1,280 | 1,280 | 0.0% | 100.0% |
| Georgetown | CO | 1,257 | 1,257 | 0.0% | 100.0% |
| Byers | CO | 1,160 | 1,160 | 0.0% | 100.0% |
| Upper Bear Creek | CO | 1,059 | 1,059 | 0.0% | 100.0% |
| Floyd Hill | CO | 998 | 998 | 0.0% | 100.0% |
| Pine Brook Hill | CO | 983 | 983 | 0.0% | 100.0% |
| Paragon Estates | CO | 928 | 928 | 0.0% | 100.0% |
| Lazy Acres | CO | 920 | 920 | 0.0% | 100.0% |
| Aspen Park | CO | 882 | 882 | 0.0% | 100.0% |
| Aetna Estates | CO | 834 | 834 | 0.0% | 100.0% |
| Bow Mar | CO | 833 | 833 | 0.0% | 100.0% |
| Foxfield | CO | 744 | 744 | 0.0% | 100.0% |
| Kiowa | CO | 734 | 734 | 0.0% | 100.0% |
| Central City | CO | 663 | 663 | 0.0% | 100.0% |
| Watkins | CO | 653 | 653 | 0.0% | 100.0% |
| Downieville-Lawson-Dumont | CO | 594 | 594 | 0.0% | 100.0% |
| Eldorado Springs | CO | 585 | 585 | 0.0% | 100.0% |
| Grand View Estates | CO | 528 | 528 | 0.0% | 100.0% |
| Allenspark | CO | 528 | 528 | 0.0% | 100.0% |
| Mountain View | CO | 521 | 521 | 0.0% | 100.0% |
| Altona | CO | 501 | 501 | 0.0% | 100.0% |
| North Washington | CO | 484 | 484 | 0.0% | 100.0% |
| Franktown | CO | 395 | 395 | 0.0% | 100.0% |
| Morrison | CO | 394 | 394 | 0.0% | 100.0% |
| Comanche Creek | CO | 369 | 369 | 0.0% | 100.0% |
| Coal Creek | CO | 368 | 368 | 0.0% | 100.0% |
| East Pleasant View | CO | 356 | 356 | 0.0% | 100.0% |
| Empire | CO | 324 | 324 | 0.0% | 100.0% |
| St. Ann Highlands | CO | 288 | 288 | 0.0% | 100.0% |
| St. Mary's | CO | 283 | 283 | 0.0% | 100.0% |
| Mountain Meadows | CO | 274 | 274 | 0.0% | 100.0% |
| Louviers | CO | 269 | 269 | 0.0% | 100.0% |
| Sugarloaf | CO | 261 | 261 | 0.0% | 100.0% |
| Idledale | CO | 252 | 252 | 0.0% | 100.0% |
| Jamestown | CO | 246 | 246 | 0.0% | 100.0% |
| Gold Hill | CO | 230 | 230 | 0.0% | 100.0% |
| Sunshine | CO | 230 | 230 | 0.0% | 100.0% |
| Elbert | CO | 230 | 230 | 0.0% | 100.0% |
| Larkspur | CO | 223 | 223 | 0.0% | 100.0% |
| Bark Ranch | CO | 213 | 213 | 0.0% | 100.0% |
| Tall Timber | CO | 208 | 208 | 0.0% | 100.0% |
| Sedalia | CO | 206 | 206 | 0.0% | 100.0% |
| Silver Plume | CO | 188 | 188 | 0.0% | 100.0% |
| Crisman | CO | 186 | 186 | 0.0% | 100.0% |
| Rollinsville | CO | 181 | 181 | 0.0% | 100.0% |
| Peoria | CO | 163 | 163 | 0.0% | 100.0% |
| Eldora | CO | 142 | 142 | 0.0% | 100.0% |
| Westcreek | CO | 129 | 129 | 0.0% | 100.0% |
| Bonanza Mountain Estates | CO | 128 | 128 | 0.0% | 100.0% |
| Ward | CO | 127 | 127 | 0.0% | 100.0% |
| Seven Hills | CO | 121 | 121 | 0.0% | 100.0% |
| Black Hawk | CO | 120 | 120 | 0.0% | 100.0% |
| Brick Center | CO | 107 | 107 | 0.0% | 100.0% |
| Valmont | CO | 59 | 59 | 0.0% | 100.0% |
| Hidden Lake | CO | 31 | 31 | 0.0% | 100.0% |
| Leyner | CO | 29 | 29 | 0.0% | 100.0% |
| Lakeside | CO | 15 | 15 | 0.0% | 100.0% |
City population is shown in full. The share of each city inside 983 is measured from Census tract centroids, not estimated from a rate-center match – so a city split between two codes appears on both, at the fraction each one actually holds. The “% of listed-city population” column uses the full populations of the cities listed here.
What counties does area code 983 cover?
3,380,487 residents across 13 counties, counted inside the 983 boundary — a county split between codes contributes only its part.
| County | State | Population in 983 | % of area-code footprint | % of County |
|---|---|---|---|---|
| Denver County | CO | 715,522 | 21% | 100% |
| Arapahoe County | CO | 655,070 | 19% | 100% |
| Jefferson County | CO | 582,910 | 17% | 100% |
| Adams County | CO | 519,572 | 15% | 100% |
| Douglas County | CO | 357,978 | 11% | 100% |
| Boulder County | CO | 330,758 | 10% | 100% |
| Weld County | CO | 93,754 | 3% | 28% |
| Broomfield County | CO | 74,112 | 2% | 100% |
| Elbert County | CO | 24,043 | 1% | 92% |
| Park County | CO | 9,762 | 0% | 56% |
| Clear Creek County | CO | 9,397 | 0% | 100% |
| Gilpin County | CO | 5,808 | 0% | 100% |
| Larimer County | CO | 1,801 | 0% | 1% |
Sources: City populations – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). State populations – the same program, Vintage 2025 (CO-EST2025-ALLDATA). Area-code footprint and county populations – 2020 Census Centers of Population, mapped against NANP area code boundaries. The share of each city inside a code is measured the same way, against Census place boundaries from the Census Bureau's TIGERweb service. Area code assignments – NANPA CO Code data. See our data methodology.
Has area code 983 been reported for unwanted calls?
Yes – 594 unwanted-call complaints were reported to the FTC for numbers showing a 983 area code (May 29 – Aug 14, 2026).
- 69% robocalls
- ↓ 41% vs prior period
Most-reported subjects
- Reducing your debt (credit cards, mortgage, student loans)44%261
- Other37%218
- Dropped call or no message7%44
Caller ID is easily spoofed, so these figures reflect the number shown on caller ID, not the caller's true location – an area code alone never identifies a caller. The FTC does not verify the facts in these complaints. Source: FTC Do Not Call (DNC) Reported Calls Data, retrieved 2026-08-17.
Which prefixes and exchanges belong to area code 983?
0% assigned to a telco
- 100% Landline
- 0% Wireless
- 0% Unknown
of 2 | ||
| Prefix | Usage | Carrier |
|---|---|---|
| (983)200- | Landline | Nuso |
| (983)983- | Landline | Onvoy Spectrum |
| No prefixes match “”. | ||
Frequently Asked Questions about the 983 Area Code
Who called me from a 983 number?
A 983 number is assigned to Denver, Colorado, so a call may come from there. But caller ID is easy to fake, and scammers often spoof a local 983 code to look nearby, so a 983 number doesn't prove the caller is local. Recently, 594 unwanted-call complaints were reported to the FTC for numbers showing the 983 code (69% flagged as robocalls). If you don't recognize the number, let it go to voicemail; a real caller will leave a message.
Is 983 a scam area code?
No area code is a scam on its own. 983 is a normal, officially assigned code for Denver, Colorado. Spam callers spoof local codes to raise the odds you answer, so 983 on your caller ID says nothing about who is really calling. Recently, 594 unwanted-call complaints were reported to the FTC for numbers showing the 983 code (69% flagged as robocalls). Judge the call itself, not the area code.
Why do I keep getting calls from the 983 area code?
Repeated calls from different 983 numbers are usually spoofing: a robocaller rotates through 983 numbers so each call looks local and slips past simple blocks. Recently, 594 unwanted-call complaints were reported to the FTC for numbers showing the 983 code (69% flagged as robocalls). Blocking one number rarely helps; voicemail screening, your carrier spam filter, and the Do Not Call Registry work better.
Should I answer an unknown 983 number?
If you aren't expecting a 983 call, let it ring to voicemail. Legitimate callers leave a message, most robocallers hang up when no one picks up, and answering can mark your number as active and bring more calls.
How do I block calls from the 983 area code?
Block a single 983 number from your recent-calls list (iPhone: tap the number, then Block this Caller; Android: tap the number, then Block or report spam). To cut the volume, turn on Silence Unknown Callers on iPhone or spam protection on Android, enable spam filtering from your carrier, and register at DoNotCall.gov. Blocking the entire 983 code also stops legitimate local calls, so use it only as a last resort.
Where is area code 983?
Area code 983 covers Denver and the surrounding area in Colorado, spanning 137 cities with about 3,380,487 residents. It shares its area with overlay codes 303, 720.
When did area code 983 go into service?
Area code 983 went into service on June 17, 2022. It was added as an overlay of 303, so 983 numbers serve the same area that 303 already covered.
Is 983 a real area code?
Yes. 983 is an active code in the North American Numbering Plan, assigned by NANPA and in service for Denver, Colorado. A real code can still show up on spoofed spam calls, so treat unknown 983 calls with normal caution.
What timezone is the 983 area code in?
The 983 area code is in the Mountain Time (MT). Because a number can be kept when someone moves or switches to VoIP, a specific 983 caller may not be in that zone.
How do I call a 983 number from abroad?
From outside the US, dial your country's exit code, then 1 (the US country code), then 983 and the seven-digit number. From a mobile phone you can usually just enter +1 983 followed by the number and let the phone add the exit code for you.