Colorado area codes
Colorado has 6 area codes, all on UTC−7 standard time. Each card shows the main cities; open one for its overlays, history and a free lookup.
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Colorado area code questions
How many area codes does Colorado have?
Colorado has 6 area codes in service: 303, 719, 720, 748, 970 and 983.
What was the original Colorado area code?
303 was among the original area codes created in 1947.
What is the newest area code in Colorado?
748, in service since July 7, 2025 as an overlay on 970.
What time zone is Colorado area codes in?
Mountain.
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Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.