County research and study

Colorado county reference

64 counties and county equivalents in Colorado. Search names or FIPS codes, compare Census geography and keep the original sources with your work.

• Adams County

  Colorado · FIPS 08001

  554,668 residents · 2025 estimate

• Alamosa County

  Colorado · FIPS 08003

  16,688 residents · 2025 estimate

• Arapahoe County

  Colorado · FIPS 08005

  673,820 residents · 2025 estimate

• Archuleta County

  Colorado · FIPS 08007

  14,306 residents · 2025 estimate

• Baca County

  Colorado · FIPS 08009

  3,347 residents · 2025 estimate

• Bent County

  Colorado · FIPS 08011

  5,716 residents · 2025 estimate

• Boulder County

  Colorado · FIPS 08013

  328,560 residents · 2025 estimate

• Broomfield County

  Colorado · FIPS 08014

  79,174 residents · 2025 estimate

• Chaffee County

  Colorado · FIPS 08015

  20,831 residents · 2025 estimate

• Cheyenne County

  Colorado · FIPS 08017

  1,713 residents · 2025 estimate

• Clear Creek County

  Colorado · FIPS 08019

  8,994 residents · 2025 estimate

• Conejos County

  Colorado · FIPS 08021

  7,529 residents · 2025 estimate

• Costilla County

  Colorado · FIPS 08023

  3,679 residents · 2025 estimate

• Crowley County

  Colorado · FIPS 08025

  5,677 residents · 2025 estimate

• Custer County

  Colorado · FIPS 08027

  5,590 residents · 2025 estimate

• Delta County

  Colorado · FIPS 08029

  32,178 residents · 2025 estimate

• Denver County

  Colorado · FIPS 08031

  740,613 residents · 2025 estimate

• Dolores County

  Colorado · FIPS 08033

  2,466 residents · 2025 estimate

• Douglas County

  Colorado · FIPS 08035

  399,396 residents · 2025 estimate

• Eagle County

  Colorado · FIPS 08037

  54,291 residents · 2025 estimate

• El Paso County

  Colorado · FIPS 08041

  757,040 residents · 2025 estimate

• Elbert County

  Colorado · FIPS 08039

  30,534 residents · 2025 estimate

• Fremont County

  Colorado · FIPS 08043

  50,039 residents · 2025 estimate

• Garfield County

  Colorado · FIPS 08045

  63,474 residents · 2025 estimate

• Gilpin County

  Colorado · FIPS 08047

  6,073 residents · 2025 estimate

• Grand County

  Colorado · FIPS 08049

  16,496 residents · 2025 estimate

• Gunnison County

  Colorado · FIPS 08051

  17,439 residents · 2025 estimate

• Hinsdale County

  Colorado · FIPS 08053

  753 residents · 2025 estimate

• Huerfano County

  Colorado · FIPS 08055

  7,011 residents · 2025 estimate

• Jackson County

  Colorado · FIPS 08057

  1,211 residents · 2025 estimate

• Jefferson County

  Colorado · FIPS 08059

  580,451 residents · 2025 estimate

• Kiowa County

  Colorado · FIPS 08061

  1,412 residents · 2025 estimate

• Kit Carson County

  Colorado · FIPS 08063

  7,069 residents · 2025 estimate

• La Plata County

  Colorado · FIPS 08067

  56,898 residents · 2025 estimate

• Lake County

  Colorado · FIPS 08065

  7,552 residents · 2025 estimate

• Larimer County

  Colorado · FIPS 08069

  377,292 residents · 2025 estimate

• Las Animas County

  Colorado · FIPS 08071

  14,391 residents · 2025 estimate

• Lincoln County

  Colorado · FIPS 08073

  5,645 residents · 2025 estimate

• Logan County

  Colorado · FIPS 08075

  20,654 residents · 2025 estimate

• Mesa County

  Colorado · FIPS 08077

  162,845 residents · 2025 estimate

• Mineral County

  Colorado · FIPS 08079

  910 residents · 2025 estimate

• Moffat County

  Colorado · FIPS 08081

  13,122 residents · 2025 estimate

• Montezuma County

  Colorado · FIPS 08083

  26,678 residents · 2025 estimate

• Montrose County

  Colorado · FIPS 08085

  44,591 residents · 2025 estimate

• Morgan County

  Colorado · FIPS 08087

  30,306 residents · 2025 estimate

• Otero County

  Colorado · FIPS 08089

  17,683 residents · 2025 estimate

• Ouray County

  Colorado · FIPS 08091

  5,265 residents · 2025 estimate

• Park County

  Colorado · FIPS 08093

  18,314 residents · 2025 estimate

• Phillips County

  Colorado · FIPS 08095

  4,420 residents · 2025 estimate

• Pitkin County

  Colorado · FIPS 08097

  16,625 residents · 2025 estimate

• Prowers County

  Colorado · FIPS 08099

  11,884 residents · 2025 estimate

• Pueblo County

  Colorado · FIPS 08101

  169,277 residents · 2025 estimate

• Rio Blanco County

  Colorado · FIPS 08103

  6,683 residents · 2025 estimate

• Rio Grande County

  Colorado · FIPS 08105

  11,087 residents · 2025 estimate

• Routt County

  Colorado · FIPS 08107

  25,329 residents · 2025 estimate

• Saguache County

  Colorado · FIPS 08109

  6,732 residents · 2025 estimate

• San Juan County

  Colorado · FIPS 08111

  813 residents · 2025 estimate

• San Miguel County

  Colorado · FIPS 08113

  7,753 residents · 2025 estimate

• Sedgwick County

  Colorado · FIPS 08115

  2,247 residents · 2025 estimate

• Summit County

  Colorado · FIPS 08117

  31,517 residents · 2025 estimate

• Teller County

  Colorado · FIPS 08119

  24,756 residents · 2025 estimate

• Washington County

  Colorado · FIPS 08121

  4,732 residents · 2025 estimate

• Weld County

  Colorado · FIPS 08123

  378,426 residents · 2025 estimate

• Yuma County

  Colorado · FIPS 08125

  9,896 residents · 2025 estimate

Use the county data

Use a county profile as a source-reading exercise or the geographic context for your own research. Keep the county FIPS identifier with your notes so that similarly named places in different states are not mixed.

The figures describe the county; they are not an evaluation of schools or an estimate of educational outcomes.

Geography: 2025 U.S. Census Gazetteer. Population: Vintage 2025 estimates, July 1, 2025. County equivalents include parishes, boroughs, independent cities and planning regions. Puerto Rico population is not supplied by this population file.