303, 720, 719, 970
These are the telephone area codes for Denver and the surrounding regions in Colorado.
How to Call Denver from Overseas
- Dial your country's exit code (International Access Code)
- Dial 1 (USA country code)
- Dial the area code (303, 720, 719, or 970)
- Dial the 7-digit local phone number
Example: Calling Downtown Denver from the UK
00 1 303 555 6666
Where:
00 = UK exit code
1 = USA country code
303 = Central Denver area code
555 6666 = Local Denver phone number
Quick Facts
303
Primary Code
+1
Country Code
10-digit
Dialing Format
011
US Exit Code
Denver Area Code Coverage
These area codes serve Denver and broader Colorado regions:
303 - Denver Metro Core
Original area code for Denver and nearby inner suburbs
720 - Denver Overlay
Serves the entire 303 region as an overlay for new numbers
719 - Southern Colorado
Colorado Springs, Pueblo, and southeastern Colorado
970 - Western & Northern Colorado
Fort Collins, Boulder, Aspen, Vail, Grand Junction
Major US Area Codes
Common Exit Codes for Calling USA
When calling Denver from these countries, use these exit codes:
United Kingdom
00
Australia
0011
European Union
00
Japan
010
China
00
Canada
011