Area Codes in Colorado — All 4 Active Codes

Colorado has 4 active area codes: 303, 719, 720, 970.

Denver uses area code 303, located in Denver, Colorado.

All area codes in Colorado are in the Mountain time zone.

Quick Answer

Colorado has 4 active area codes: 303, 719, 720, 970. All Colorado area codes are in the Mountain time zone. Data source: NANPA.

All Area Codes in Colorado

Code	Region	Major Cities	Timezone
303	Denver	Denver, Boulder, Aurora (part)	Mountain
719	Southern Colorado	Colorado Springs, Pueblo, Canon City	Mountain
720	Denver (overlay)	Denver, Aurora, Lakewood	Mountain
970	Western Colorado	Fort Collins, Greeley, Grand Junction	Mountain

How many area codes does Colorado have?

Colorado has 4 active area codes: 303, 719, 720, 970.

What are the area codes in Colorado?

The area codes in Colorado are: 303 (Denver), 719 (Southern Colorado), 720 (Denver (overlay)), 970 (Western Colorado).

What area code is Denver?

Denver uses area code 303, located in Denver, Colorado.

What time zone are Colorado area codes in?

All area codes in Colorado are in the Mountain time zone.