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The 64 counties of the U.S. State of Colorado. |
This list ranks the 64 counties of the U.S. State of Colorado[1] by population as of July 1, 2023, as estimated by the United States Census Bureau.[a] This list also details the county population changes since the 2000 United States Census.[3]
El Paso County with a 2023 population estimate of 744,215 remains the most populous county in Colorado, while Hinsdale County with a 2023 population of 765 is now the least populous county. Five of the 64 Colorado counties have more than 500,000 residents, while 12 have fewer than 5,000 residents.[a]
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