Colorado area codes
- Area codes in
- 5
- State
- Colorado
- 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 8 October 2026
Now in Colorado
Mountain Time · UTC−7, UTC−6 in summer
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Mountain Time
Typical business hours, 9 to 5 Monday to Friday.
Typical business hours, 9 to 5 Monday to Friday, shown as the blue arc. A guide to when a real Colorado office is likely to answer. It says nothing about who called you.
01
All area codes in Colorado
02
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.
03
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.
04
Spam call reports in Colorado
These Colorado area codes drew the most reports to the FTC in the 30 days to 8 October 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 (30 days) |
|---|---|---|---|
| 1 | 303 | Denver | 855 |
| 2 | 720 | Denver | 827 |
| 3 | 970 | Fort Collins | 822 |
| 4 | 719 | Colorado Springs | 649 |
| 5 | 983 | Denver | 161 |
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 8 October 2026. Request a correction. Month-over-month figures appear once two complete 30-day windows exist.
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05
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, wherever an overlay operates. 2 of Colorado’s area codes are overlays, and local calls within an overlay area require the full ten-digit number.
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 8 October 2026, with 855 numbers reported.
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