Colorado area codes
- Area codes in
- 5
- State
- Colorado
- Local time
- Mountain Time
Colorado is served by 5 area codes, from 303 in 1947 to 983 in 2022. 2 of them are overlays, added as older codes filled up.
Updated 28 July 2026
All area codes in Colorado
Colorado is served by 5 area codes. 303 is the oldest, in service since 1947; 983 is the newest, activated in 2022.
Colorado area code map
Colorado sits in the Mountain Time zone, with its 5 codes spread across the state.
Colorado area codes by city
These are the Colorado cities served by more than one area code, or whose code also covers a wider area.
Colorado Springs
Fort Collins
Overlay codes and dialling rules in Colorado
2 of Colorado’s 5 area codes are overlays — a second code laid over an existing footprint instead of splitting it. Wherever an overlay operates, local calls require the full ten-digit number.
Spam call reports in Colorado
These Colorado area codes drew the most reports to the FTC in the 30 days to 28 July 2026. The figures describe numbers displaying each code, which caller ID spoofing can fake.
Most reported Colorado area codes · last 30 days
| Code | Primary city | Reports |
|---|---|---|
| 303 | Denver | 1,059 |
| 970 | Fort Collins | 995 |
| 720 | Denver | 690 |
| 719 | Colorado Springs | 642 |
| 983 | Denver | 185 |
A number listed here may itself be a spoofing victim rather than the caller. These are unverified consumer reports.
Source: FTC Do Not Call Reported Calls Data, unverified consumer reports, retrieved 28 July 2026. Request a correction.
Calls from your Colorado numbers not landing?
Questions
How many area codes does Colorado have?
Colorado has 5 area codes: 303, 719, 720, 970, 983.
What is the main area code for Denver?
The main area code for Denver is 303.
Which Colorado area code is oldest?
Area code 303 is the oldest in Colorado, in service since 1947.
Do I need to dial ten digits in Colorado?
Yes, anywhere an overlay operates. 2 of Colorado’s codes are overlays, and ten-digit dialling is required for local calls in those areas.
Which Colorado area code gets the most spam calls?
Area code 303 (Denver) drew the most reports of any Colorado code in the 30 days to 28 July 2026, with 1,059 numbers reported.