Colorado Area Codes
6 active area codes · Denver · Population around 5,079,983
Colorado has 6 active area codes, serving cities like Denver, Colorado Springs, and Aurora. Some of them are overlays that share the same territory, so local calls there use all ten digits. Each code below links to its cities, carriers, timezone, and coverage map.
Colorado Area Code Map
What area codes does Colorado have?
- 303OverlayDenverMountain Time (MT) · 137 cities · 3,173,465
- 719Colorado SpringsMountain Time (MT) · 147 cities · 937,306
- 720OverlayDenverMountain Time (MT) · 137 cities · 3,173,465
- 748OverlayFort CollinsMountain Time (MT) · 176 cities · 981,128
- 970OverlayFort CollinsMountain Time (MT) · 176 cities · 981,128
- 983DenverMountain Time (MT) · 137 cities · 3,173,465
Which cities are the largest in Colorado?
| # | City | Area Codes | Population |
|---|---|---|---|
| 1 | Arvada | 303 / 720 / 983 | 121,873 |
| 2 | Aurora | 303 / 720 / 983 | 403,130 |
| 3 | Colorado Springs | 719 | 493,554 |
| 4 | Denver | 303 / 720 / 983 | 729,019 |
| 5 | Fort Collins | 970 / 748 | 170,924 |
| 6 | Greeley | 970 / 748 | 114,363 |
| 7 | Lakewood | 303 / 720 / 983 | 156,868 |
| 8 | Pueblo | 719 | 111,166 |
| 9 | Thornton | 303 / 720 / 983 | 146,689 |
| 10 | Westminster | 303 / 720 / 983 | 115,302 |
* Sources: Population – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). Area code assignments – NANPA CO Code data. See our data methodology.
Frequently Asked Questions
How many area codes does Colorado have?
Colorado has 6 active area codes: 303, 719, 720, 748, 970, 983.
What is the main area code for Colorado?
The 303 area code is among the primary area codes for Colorado, serving Denver and surrounding communities.
What are the largest cities in Colorado?
The largest cities in Colorado include Denver, Colorado Springs, Aurora, Fort Collins, Lakewood.
What is the total population of Colorado?
Colorado has an estimated total population of 5,079,983 based on US Census PEP 2024 data.