County facts · Population · October 24, 2026
Colorado Population by County, 2025 Census Estimates
Colorado population by county: July 2025 Census estimates for all 64 counties, change since 2020, density, and a link to each official parcel map.
Looking for Colorado population by county? The Census Bureau estimates that Colorado had 6,012,561 residents on July 1, 2025, spread across 64 counties. El Paso County is the most populous, with 757,040 people (13% of the state), and Hinsdale County is the least populous, with 753.
The table below lists every county with its 2025 estimate, its April 2020 starting point, the change, people per square mile, and a link to its official parcel viewer.
Colorado population at a glance
- Counties: 64
- Statewide, July 1, 2025: 6,012,561 (April 1, 2020 estimates base: 5,775,326; change +237,235, +4.1%)
- Most populous: El Paso County (757,040); least populous: Hinsdale County (753)
- Median county: about 15,444 residents (half of the counties are smaller)
- The 5 largest counties hold 55% of all Colorado residents
- Counties with 1,000,000+ residents: 0 · 100,000+: 11 · under 10,000: 27
- Statewide density: about 58 people per square mile of land
Colorado population by county, July 2025 (all 64)
| # | County | Jul 2025 | Apr 2020 | % change | People per sq mi | Parcel viewer |
|---|---|---|---|---|---|---|
| 1 | El Paso County | 757,040 | 731,786 | +3.5% | 356 | Spatialest |
| 2 | Denver County | 740,613 | 715,509 | +3.5% | 4,838 | county web map |
| 3 | Arapahoe County | 673,820 | 655,085 | +2.9% | 845 | county web map |
| 4 | Jefferson County | 580,451 | 582,929 | −0.4% | 759 | county web map |
| 5 | Adams County | 554,668 | 519,580 | +6.8% | 475 | county web map |
| 6 | Douglas County | 399,396 | 357,993 | +11.6% | 475 | ArcGIS Experience Builder |
| 7 | Weld County | 378,426 | 328,981 | +15.0% | 95 | county web map |
| 8 | Larimer County | 377,292 | 359,069 | +5.1% | 145 | county web map |
| 9 | Boulder County | 328,560 | 330,761 | −0.7% | 452 | county web map |
| 10 | Pueblo County | 169,277 | 168,167 | +0.7% | 71 | GSA property search map |
| 11 | Mesa County | 162,845 | 155,710 | +4.6% | 49 | county web map |
| 12 | Broomfield County | 79,174 | 74,103 | +6.8% | 2,402 | ArcGIS Web AppBuilder |
| 13 | Garfield County | 63,474 | 61,686 | +2.9% | 22 | county web map |
| 14 | La Plata County | 56,898 | 55,635 | +2.3% | 34 | county web map |
| 15 | Eagle County | 54,291 | 55,721 | −2.6% | 32 | county web map |
| 16 | Fremont County | 50,039 | 48,937 | +2.3% | 33 | ArcGIS Experience Builder |
| 17 | Montrose County | 44,591 | 42,684 | +4.5% | 20 | county web map |
| 18 | Delta County | 32,178 | 31,203 | +3.1% | 28 | county web map |
| 19 | Summit County | 31,517 | 31,289 | +0.7% | 52 | ArcGIS Experience Builder |
| 20 | Elbert County | 30,534 | 26,050 | +17.2% | 16 | ArcGIS Web AppBuilder |
| 21 | Morgan County | 30,306 | 29,110 | +4.1% | 24 | Colorado Public Parcel Map |
| 22 | Montezuma County | 26,678 | 25,848 | +3.2% | 13 | Colorado Public Parcel Map |
| 23 | Routt County | 25,329 | 24,829 | +2.0% | 11 | Colorado Public Parcel Map |
| 24 | Teller County | 24,756 | 24,708 | +0.2% | 44 | ArcGIS Web AppBuilder |
| 25 | Chaffee County | 20,831 | 19,475 | +7.0% | 21 | Beacon (Schneider Geospatial) |
| 26 | Logan County | 20,654 | 21,532 | −4.1% | 11 | Colorado Public Parcel Map |
| 27 | Park County | 18,314 | 17,397 | +5.3% | 8.3 | ArcGIS Experience Builder |
| 28 | Otero County | 17,683 | 18,685 | −5.4% | 14 | GSA property search map |
| 29 | Gunnison County | 17,439 | 16,921 | +3.1% | 5.4 | county web map |
| 30 | Alamosa County | 16,688 | 16,378 | +1.9% | 23 | qPublic (Schneider Geospatial) |
| 31 | Pitkin County | 16,625 | 17,362 | −4.2% | 17 | county web map |
| 32 | Grand County | 16,496 | 15,714 | +5.0% | 8.9 | listed link under review |
| 33 | Las Animas County | 14,391 | 14,553 | −1.1% | 3.0 | ArcGIS Web AppBuilder |
| 34 | Archuleta County | 14,306 | 13,356 | +7.1% | 11 | ArcGIS |
| 35 | Moffat County | 13,122 | 13,293 | −1.3% | 2.8 | ArcGIS Instant Apps |
| 36 | Prowers County | 11,884 | 11,997 | −0.9% | 7.3 | Beacon (Schneider Geospatial) |
| 37 | Rio Grande County | 11,087 | 11,539 | −3.9% | 12 | Colorado Public Parcel Map |
| 38 | Yuma County | 9,896 | 9,985 | −0.9% | 4.2 | Colorado Public Parcel Map |
| 39 | Clear Creek County | 8,994 | 9,364 | −4.0% | 23 | county web map |
| 40 | San Miguel County | 7,753 | 8,068 | −3.9% | 6.0 | Colorado Public Parcel Map |
| 41 | Lake County | 7,552 | 7,432 | +1.6% | 20 | ArcGIS Experience Builder |
| 42 | Conejos County | 7,529 | 7,464 | +0.9% | 5.8 | listed link under review |
| 43 | Kit Carson County | 7,069 | 7,081 | −0.2% | 3.3 | no verified public viewer listed yet |
| 44 | Huerfano County | 7,011 | 6,812 | +2.9% | 4.4 | county web map |
| 45 | Saguache County | 6,732 | 6,373 | +5.6% | 2.1 | Colorado Public Parcel Map |
| 46 | Rio Blanco County | 6,683 | 6,528 | +2.4% | 2.1 | Colorado Public Parcel Map |
| 47 | Gilpin County | 6,073 | 5,803 | +4.7% | 40 | ArcGIS Map Viewer |
| 48 | Bent County | 5,716 | 5,643 | +1.3% | 3.8 | no verified public viewer listed yet |
| 49 | Crowley County | 5,677 | 5,927 | −4.2% | 7.2 | no verified public viewer listed yet |
| 50 | Lincoln County | 5,645 | 5,678 | −0.6% | 2.2 | no verified public viewer listed yet |
| 51 | Custer County | 5,590 | 4,707 | +18.8% | 7.6 | Colorado Public Parcel Map |
| 52 | Ouray County | 5,265 | 4,879 | +7.9% | 9.7 | ArcGIS Instant Apps |
| 53 | Washington County | 4,732 | 4,816 | −1.7% | 1.9 | Colorado Public Parcel Map |
| 54 | Phillips County | 4,420 | 4,534 | −2.5% | 6.4 | ArcGIS Experience Builder |
| 55 | Costilla County | 3,679 | 3,494 | +5.3% | 3.0 | ArcGIS Experience Builder |
| 56 | Baca County | 3,347 | 3,506 | −4.5% | 1.3 | no verified public viewer listed yet |
| 57 | Dolores County | 2,466 | 2,325 | +6.1% | 2.3 | ArcGIS Web AppBuilder |
| 58 | Sedgwick County | 2,247 | 2,404 | −6.5% | 4.1 | Colorado Public Parcel Map |
| 59 | Cheyenne County | 1,713 | 1,749 | −2.1% | 1.0 | ArcGIS Experience Builder |
| 60 | Kiowa County | 1,412 | 1,446 | −2.4% | 0.8 | qPublic (Schneider Geospatial) |
| 61 | Jackson County | 1,211 | 1,380 | −12.2% | 0.8 | county web map |
| 62 | Mineral County | 910 | 865 | +5.2% | 1.0 | no verified public viewer listed yet |
| 63 | San Juan County | 813 | 704 | +15.5% | 2.1 | ArcGIS Web AppBuilder |
| 64 | Hinsdale County | 753 | 784 | −4.0% | 0.7 | ArcGIS Experience Builder |
Percent change runs from the April 1, 2020 estimates base to July 1, 2025. People per square mile is the July 2025 estimate divided by the county's land area in the Census Bureau's 2020 Gazetteer file, so lakes and bays are left out.
How Colorado's population is spread out
Grouping the counties by size shows how concentrated the state is:
| Residents (July 2025) | Counties | Total residents | Share of state |
|---|---|---|---|
| 250,000 to 999,999 | 9 | 4,790,266 | 80% |
| 100,000 to 249,999 | 2 | 332,122 | 6% |
| 25,000 to 99,999 | 12 | 525,009 | 9% |
| 10,000 to 24,999 | 14 | 234,276 | 4% |
| Under 10,000 | 27 | 130,888 | 2% |
9 counties with at least 250,000 residents hold 80% of the state's population.
Most and least densely populated
The most crowded counties by people per square mile of land:
- Denver County: 4,838 per sq mi (740,613 people on 153 sq mi)
- Broomfield County: 2,402 per sq mi (79,174 people on 33 sq mi)
- Arapahoe County: 845 per sq mi (673,820 people on 798 sq mi)
- Jefferson County: 759 per sq mi (580,451 people on 764 sq mi)
- Adams County: 475 per sq mi (554,668 people on 1,167 sq mi)
The most thinly settled:
- Hinsdale County: 0.7 per sq mi (753 people on 1,117 sq mi)
- Jackson County: 0.8 per sq mi (1,211 people on 1,614 sq mi)
- Kiowa County: 0.8 per sq mi (1,412 people on 1,768 sq mi)
- Cheyenne County: 1.0 per sq mi (1,713 people on 1,778 sq mi)
- Mineral County: 1.0 per sq mi (910 people on 876 sq mi)
About these numbers
- They are estimates. Between censuses the Census Bureau's Population Estimates Program updates county totals each year from births, deaths and migration records. The next full count is the 2030 census.
- The base is April 1, 2020. The estimates start from an April 1, 2020 "estimates base" built from the 2020 census, which is why it is slightly different from the published census count.
- Each new release revises the past. A newer vintage can change earlier years as well, so compare numbers from the same release, as this page does.
- Statewide total. The counties add up exactly to the statewide figure of 6,012,561 in the same file.
Using population numbers in a land search
- Big counties, busy offices. In the most populous counties, parcel maps and deed records are usually online and searchable, but recording and permit offices are busier. Allow for that if you are on a deadline.
- Small counties, fewer sales. In counties with only a few thousand people, land changes hands less often, so there are fewer recent sales to compare a price with. The county assessor's sales records are the best source.
- Density hints at lot size. A low people-per-square-mile figure usually means farms, ranches and timber tracts; a high one means subdivided lots. The parcel viewer shows the actual parcel lines.
- Check the official map. Use the parcel viewer link in the table for boundaries, parcel numbers and owner names, then confirm anything important with the county's recorder or assessor.
Related guides
- Fastest growing counties in Colorado
- Largest counties in Colorado
- Colorado county GIS websites by viewer
- Colorado plat maps
- Colorado parcel map guide
- Colorado landowner maps for hunting
- Most populous counties in the US
- Where people are moving in the US
More: All Colorado counties on Platbookmapper
Sources
- U.S. Census Bureau, Population Estimates Program, county totals, Vintage 2025 (April 1, 2020 estimates base and July 1, 2020–2025 estimates, with components of change). Statewide totals are the sum of the counties and match the file's state row.
- U.S. Census Bureau Gazetteer files, 2020 county land and water area (for people per square mile).
- Platbookmapper county GIS directory (live data file behind our county pages, pulled October 24, 2026) for each official parcel viewer.