Colorado’s 6 Local Area Codes

Colorado is a big state land-wise, covering an estimated 104,185 square miles, the 8th largest in the US. Although population-wise wise around 5 million of the estimated 5.8 million all live along the same front range region.

There are 6 local area codes you might come across while perusing phone numbers in Colorado. Three of these are for the Denver Metro, 303/720/983. One is for Southern Colorado, 719. The last two are the northeast, northwest, and southwest of the state, 970/748.

303

The 303 is a number synonymous with Denver and Colorado. It was established as Colorado’s area code in 1947. This is the primary area code for the Mile High City, as well as cities like Golden, Boulder, and front range mountain towns to the west like Idaho Springs. You’ll see the numbers “303” along with “5280” (for elevation) used in businesses and names across the metro.

719

Going south to Colorado Springs from Denver will change to 719. This extends westward into the mountains, to towns like Alamosa, Canon City, Fairplay, and Buena Vista. As well as south to Trinidad at the New Mexico border. This was Colorado’s second area code in 1988, splitting up the region.

970

This area code probably covers the largest range. It came along in 1995, adding to 719 and 970. It’s found on both the Front Range and the Western Slope. You’ll see 970 everywhere from Fort Collins to the northwest to Steamboat Springs and Grand Junction. Then running south along the western slope through Gunnison, Aspen, Vail, down to Durango and Pagosa Springs. Going back east over the continental divide leads back over to the 719 or 303 further north.

720

Along with 303, 720 is seen and given out by phone companies throughout the Denver area. It was added in 1998 to go along with the Mile High. Although it doesn’t get as much love as the 303. Going north to Loveland and Fort Collins numbers will switch to 970.

983

Introduced on June 17, 2022, to the Denver Metropolitan Area, 983 joined alongside 303 and 720, the area codes you’ll hear around Denver, Aurora, Littleton, and other local suburbs. It has been implemented by the Colorado Phone Commission to replace the depleted available 303 and 720 numbers. It’s thought the supply of 983s will run for 25 years once the current supply of 720 and 303 runs out.

748

The newest Colorado area code went into operation on July 7, 2025. It joined the existing 970 region, spanning from the western slope to the eastern plains. It’s expected to last for around 38 years and begin to go into widespread use in 2026 once the last of the 970 numbers is used up.