720 Area Code - Denver
The 720 area code includes the cities of Denver, Brighton, Henderson, Aurora, Longmont, Littleton, and other nearby municipalities. Both the 720 and 303 area codes cover the smallest geographic area but contain the densest population within the State of Colorado.
303 Area Code - Denver
The 303 area code primarily includes the Denver Metro Area. This includes the cities of Denver, Aurora, Castle Rock, Parker, Englewood, Littleton, Boulder, and Broomfield. In combination with the 720 area code, the two area codes overlap and cover the largest number of residents in Colorado.
303 was the first area code of Denver and is the oldest area code in the State of Colorado. The 303 area code was introduced in Colorado back in 1947.
719 Area Code - Colorado Springs
The 719 area code encompasses the majority of southern Colorado including Colorado Springs, Monument, Fountain, Pueblo, Salida, Trinidad, Burlington, Lamar, Salida, Alamosa, Creed, Woodland Park, West Cliff, and Canyon City.
970 Area Code - Grand Junction
The 970 area code covers the largest geographic area in Colorado. This area code includes the cities of Fort Collins, Grand Junction, Aspen, Vail, Crested Butte, Durango, Montrose, Glenwood Springs, and more.
938 Area Code - Denver Metro
As of summer 2022, the Denver Metro area has introduced the new 938 Area Code. Because of it’s fast growing population, the Denver Metro Area adopted a third area code in addition to the 303 and 720 area code.
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