983 Area CodeDenver, CO
Area code 983 covers Denver and nearby communities in Colorado, in the Mountain Time (MT) zone, home to about 3.2 million people across 137 cities. It's the only area code for this region, so the three digits alone place the caller.
Overview
- Major City
- Denver
- State
- Colorado (CO)
- Timezone
- Mountain Time (MT)
- Current Time
- Overlay
- No – unique area code
Where is area code 983?
Area code 983 serves part of Denver, CO and the surrounding areas. It is a unique area code with no overlays.
Overview of the 983 Area Code
What is the 983 area code?
The 983 area code serves Denver, Colorado. When you see a 983 number, it indicates a local number within this geographic area.
Why was area code 983 created?
The 983 area code was established to serve the Denver region in Colorado. It provides telephone number coverage across 137 cities.
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. 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. No other area code overlaps the 983 territory, so the prefix alone identifies where the caller is. Inside 983, Denver holds about 23% of the population; the rest is split across 136 smaller cities.
Denver Area Code Overview
The 983 area code provides comprehensive telephone coverage for Denver and its surrounding communities. As the sole area code for this region, it uniquely identifies all local numbers within the service area.
What cities does area code 983 cover?
| City | State | Population | % of Area Code | % of City |
|---|---|---|---|---|
| Denver | CO | 729,019 | 2% | 100% |
| Aurora | CO | 403,130 | 2% | 100% |
| Lakewood | CO | 156,868 | 1% | 100% |
| Thornton | CO | 146,689 | 1% | 100% |
| Arvada | CO | 121,873 | 1% | 100% |
| Westminster | CO | 115,302 | 0% | 100% |
| Centennial | CO | 108,853 | 0% | 100% |
| Boulder | CO | 106,803 | 0% | 100% |
| Longmont | CO | 99,818 | 0% | 100% |
| Highlands Ranch | CO | 96,713 | 0% | 100% |
* Sources: Population – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). Area code assignments – NANPA CO Code data. See our data methodology.
Has area code 983 been reported for unwanted calls?
Yes – 345 unwanted-call complaints were reported to the FTC for numbers showing a 983 area code (May 29 – Jul 2, 2026).
- 63% robocalls
- ↑ 9% vs prior period
Most-reported subjects
- Reducing your debt (credit cards, mortgage, student loans)41%143
- Other37%126
- Dropped call or no message9%32
* 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 2026-07-05.
Which prefixes and exchanges belong to area code 983?
0% assigned to a telco
- 100% Landline
- 0% Wireless
- 0% Unknown
| Prefix | Usage | Carrier |
|---|---|---|
| (983)200- | Landline | Nuso |
| (983)983- | Landline | Onvoy Spectrum |
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, 345 unwanted-call complaints were reported to the FTC for numbers showing the 983 code (63% 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, 345 unwanted-call complaints were reported to the FTC for numbers showing the 983 code (63% 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, 345 unwanted-call complaints were reported to the FTC for numbers showing the 983 code (63% 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 3,173,465 residents. No other code overlays this region, so 983 alone identifies the area.
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.