Colorado Counties by Population (2025)

The most populous counties in Colorado are El Paso County with 752,772, Denver County at 729,019, Arapahoe County with 666,918, Jefferson County at 578,533, and Adams County with 542,973. 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 2024 Population Estimates Program.

Sure, you can copy this list right into your favorite spreadsheet tool. Or save yourself formatting headaches and grab the latest Colorado counties population data as a ready-to-use Excel™ file below. It's time to stop searching and start digging into data!