Colorado Area Codes
5 area codes in Colorado, United States. Country code: +1. Find area codes by city and region.
All Colorado Area Codes
| Area Code | Major Cities | Region |
|---|---|---|
| 303 | Denver | Denver Metro |
| 719 | Colorado Springs, Pueblo | South |
| 720 | Denver (overlay) | Denver Metro |
| 970 | Fort Collins, Grand Junction | North/West |
| 983 | Denver (overlay) | Denver Metro |
About Colorado Area Codes
Colorado uses 5 area codes under the North American Numbering Plan (NANP), serving Colorado Springs, Denver, Fort Collins, Grand Junction, Pueblo. Each code follows the 3-digit format and covers a defined geographic region within the state.
Overlay Codes in Colorado
Colorado has adopted 2 overlay code(s): 720, 983. An overlay assigns a new area code to the same geographic region as an existing code, so both codes serve the same area. When overlay codes are active, callers must dial all 10 digits (area code + number) even for local calls within the same region.
Major Cities and Their Area Codes
Find which area code serves each major city in Colorado.
| City / Community | Area Code(s) |
|---|---|
| Colorado Springs | 719 |
| Denver | 303 |
| Fort Collins | 970 |
| Grand Junction | 970 |
| Pueblo | 719 |
How to Call Colorado
Within the US: dial 1 + area code + 7-digit number (10-digit dialing applies where overlays are active).
From Canada or the Caribbean: the same NANP format applies — 1 + area code + number.
From abroad: dial your country's exit code (011 from the US, 00 from most countries, or + on mobile), then 1, then the Colorado area code and number.
Example (from the UK): 00 1 303 XXX XXXX
Data source: North American Numbering Plan Administration (NANPA), ITU-T E.164. Area code assignments change with new overlays — verify with your carrier before dialing. NANPA