The northeastern and western portions of area code 303, including Fort Collins, Grand Junction, Vail and Aspen, switched to area code 970 on April 2, 1995, reducing 303 to the Denver-Boulder area. ![]() On March 5, 1988, southeastern Colorado, including Colorado Springs and Pueblo, received area code 719. An impending number shortage in the late 1980s meant this split could no longer be staved off. ![]() It remained the state's sole area code for 40 years.Ĭolorado's explosive growth in the second half of the 20th century, particularly in the Denver/Boulder area, made it a certainty that Colorado would need another area code. ![]() ![]() Area code 303 was one of the original North American area codes of 1947, and originally served the entire state of Colorado.
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