Colorado Counties by Population (2024)

Population

100K

200K

300K

400K

500K

600K

700K

Hover/click a county for data.

64 counties

County
2024 Pop.
Change (2020)
Area (mi²)
Density (/mi²)
Location
El Paso County747,8342.11%821352El Paso County location
Denver County719,7010.29%594,704Denver County location
Arapahoe County655,8530.09%308822Arapahoe County location
Jefferson County576,921-1.06%295755Jefferson County location
Adams County539,2213.6%450462Adams County location
Douglas County391,8758.76%325466Douglas County location
Larimer County373,9653.9%1K144Larimer County location
Weld County368,61811.21%1.5K93Weld County location
Boulder County326,323-1.39%280449Boulder County location
Pueblo County169,3720.61%92171Pueblo County location
Mesa County160,8313.09%1.3K48Mesa County location
Broomfield County77,5254.07%132,349Broomfield County location
Garfield County63,1582.21%1.1K21Garfield County location
La Plata County56,2611.06%65233La Plata County location
Eagle County53,544-3.8%65032Eagle County location
Fremont County51,0204.38%59233Fremont County location
Montrose County44,5053.94%86520Montrose County location
Delta County31,9322.82%44128Delta County location
Summit County30,294-2.28%23550Summit County location
Morgan County29,7822.43%49423Morgan County location
Elbert County29,77013.56%71416Elbert County location
Montezuma County26,5952.73%78313Montezuma County location
Routt County25,0560.9%91211Routt County location
Teller County24,374-1.5%21544Teller County location
Chaffee County20,9697.62%39121Chaffee County location
Logan County20,446-3.6%71011Logan County location
Park County18,3135.14%8478Park County location
Otero County17,961-3.77%48714Otero County location
Gunnison County17,3222.19%1.3K5Gunnison County location
Alamosa County16,7232.11%27923Alamosa County location
Pitkin County16,433-5.31%37517Pitkin County location
Grand County16,1362.47%7139Grand County location
Archuleta County14,3897.19%52111Archuleta County location
Las Animas County14,385-0.72%1.8K3Las Animas County location
Moffat County13,4491.36%1.8K3Moffat County location
Prowers County11,629-3.23%6327Prowers County location
Rio Grande County11,039-4.35%35212Rio Grande County location
Yuma County9,829-1.42%9134Yuma County location
Clear Creek County8,927-4.96%15223Clear Creek County location
San Miguel County7,728-4.05%4976San Miguel County location
Conejos County7,4550.05%4976Conejos County location
Lake County7,384-0.32%14620Lake County location
Huerfano County7,0132.72%6144Huerfano County location
Kit Carson County7,005-0.81%8343Kit Carson County location
Saguache County6,7495.63%1.2K2Saguache County location
Rio Blanco County6,5891.06%1.2K2Rio Blanco County location
Gilpin County5,9662.51%5840Gilpin County location
Bent County5,9238.22%5844Bent County location
Custer County5,73121.34%2858Custer County location
Crowley County5,645-0.76%3047Crowley County location
Lincoln County5,450-3.74%1K2Lincoln County location
Ouray County5,2497.52%20910Ouray County location
Washington County4,8631.04%9722Washington County location
Phillips County4,504-0.51%2667Phillips County location
Costilla County3,6413.97%4743Costilla County location
Baca County3,253-6.52%9861Baca County location
Dolores County2,56610.08%4122Dolores County location
Sedgwick County2,312-3.22%2124Sedgwick County location
Cheyenne County1,723-1.32%6861Cheyenne County location
Kiowa County1,334-8.32%6821Kiowa County location
Jackson County1,304-5.44%6231Jackson County location
Mineral County9579.5%3381Mineral County location
San Juan County79812.24%1502San Juan County location
Hinsdale County759-3.68%4311Hinsdale County location
  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)

Sources