Colorado Counties by Population (2025)

The most populous counties in Colorado are El Paso County with 744,215, Denver County at 716,577, Arapahoe County with 656,061, Jefferson County at 576,366, and Adams County with 533,365. You can get the most current Census population data for all 64 Colorado counties, sorted from the most populous counties in Colorado to the least, according to the 2023 Population Estimates Program.

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