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Population of Counties in Colorado (2024)

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2024 Population
Growth Since 2020
Area (mi²)
Density (/mi²)
El Paso County747,8342.11%2.1K352El Paso County location
Denver County719,7010.29%1534,704Denver County location
Arapahoe County655,8530.09%798822Arapahoe County location
Jefferson County576,921-1.06%764755Jefferson County location
Adams County539,2213.6%1.2K462Adams County location
Douglas County391,8758.76%841466Douglas County location
Larimer County373,9653.9%2.6K144Larimer County location
Weld County368,61811.21%4K93Weld County location
Boulder County326,323-1.39%726449Boulder County location
Pueblo County169,3720.61%2.4K71Pueblo County location
Mesa County160,8313.09%3.3K48Mesa County location
Garfield County63,1582.21%2.9K21Garfield County location
La Plata County56,2611.06%1.7K33La Plata County location
Eagle County53,544-3.8%1.7K32Eagle County location
Fremont County51,0204.38%1.5K33Fremont County location
Montrose County44,5053.94%2.2K20Montrose County location
Delta County31,9322.82%1.1K28Delta County location
Summit County30,294-2.28%60850Summit County location
Morgan County29,7822.43%1.3K23Morgan County location
Elbert County29,77013.56%1.9K16Elbert County location
Montezuma County26,5952.73%2K13Montezuma County location
Routt County25,0560.9%2.4K11Routt County location
Teller County24,374-1.5%55744Teller County location
Chaffee County20,9697.62%1K21Chaffee County location
Logan County20,446-3.6%1.8K11Logan County location
Park County18,3135.14%2.2K8Park County location
Otero County17,961-3.77%1.3K14Otero County location
Gunnison County17,3222.19%3.2K5Gunnison County location
Alamosa County16,7232.11%72323Alamosa County location
Pitkin County16,433-5.31%97117Pitkin County location
Grand County16,1362.47%1.8K9Grand County location
Archuleta County14,3897.19%1.4K11Archuleta County location
Las Animas County14,385-0.72%4.8K3Las Animas County location
Moffat County13,4491.36%4.7K3Moffat County location
Prowers County11,629-3.23%1.6K7Prowers County location
Rio Grande County11,039-4.35%91212Rio Grande County location
Yuma County9,829-1.42%2.4K4Yuma County location
Clear Creek County8,927-4.96%39523Clear Creek County location
San Miguel County7,728-4.05%1.3K6San Miguel County location
Conejos County7,4550.05%1.3K6Conejos County location
Lake County7,384-0.32%37720Lake County location
Huerfano County7,0132.72%1.6K4Huerfano County location
Kit Carson County7,005-0.81%2.2K3Kit Carson County location
Saguache County6,7495.63%3.2K2Saguache County location
Rio Blanco County6,5891.06%3.2K2Rio Blanco County location
Gilpin County5,9662.51%15040Gilpin County location
Bent County5,9238.22%1.5K4Bent County location
Custer County5,73121.34%7398Custer County location
Crowley County5,645-0.76%7877Crowley County location
Lincoln County5,450-3.74%2.6K2Lincoln County location
Ouray County5,2497.52%54110Ouray County location
Washington County4,8631.04%2.5K2Washington County location
Phillips County4,504-0.51%6887Phillips County location
Costilla County3,6413.97%1.2K3Costilla County location
Baca County3,253-6.52%2.6K1Baca County location
Dolores County2,56610.08%1.1K2Dolores County location
Sedgwick County2,312-3.22%5484Sedgwick County location
Cheyenne County1,723-1.32%1.8K1Cheyenne County location
Kiowa County1,334-8.32%1.8K1Kiowa County location
Jackson County1,304-5.44%1.6K1Jackson County location
Mineral County9579.5%8761Mineral County location
San Juan County79812.24%3882San Juan County location
Hinsdale County759-3.68%1.1K1Hinsdale County location
showing: 63 rows

There are 63 counties in Colorado. The most populous county in Colorado in 2019 is Denver County, home of Denver, with a population of 704,621. This represents significant population growth of 16.81% since the 2010 census. Colorado is home to several other counties exceeding 500,000 residents including El Paso County (699,232), Arapahoe County (643,052), Jefferson County (574,613), and Adams County (503,167). All of these counties have experienced population growth of at least 7% but not exceeding Denver County's growth.

Colorado Counties with Fewest Residents

The smallest county in Colorado in terms of population is San Juan County with just 715 people, up 0.99% from the last census. There are two other counties in Colorado with populations under 800: Mineral County (766) and Hinsdale County (794). Colorado has a total of 26 counties under 10,000 residents. Other small Colorado counties include Kiowa County (1,376), Jackson County (1,385), Cheyenne County (1,845), Dolores County (2,067), and Sedgwick County (2,344). The most significant growth among these counties was Mineral County at 8.81%. Hinsdale County experienced the most dramatic decline with a growth rate of -5.92%.

Colorado Counties with Rapid Growth

Broomsfield County, Colorado experienced the most significant population growth in the state since the census, growing by 21.57%. Other counties with rapid growth rates include Weld County (19.85%), Douglas County (16.85%), Denver County (16.81%), and Larimer County (14.50%). The county that has experienced the most extreme negative growth is Kit Carson County with a growth rate of -13.38% which has brought its population down to 7,158.

Population of Counties in Colorado (2024)

Lists of Counties in all States

  1. Colorado State Demography Office
  2. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  3. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  4. American Community Survey (2009 - 2013)
  5. Census QuickFacts
  6. Historical Populations of States and Counties (1790 - 1990)