Colorado county populations
64 supported county-equivalent records in Colorado; July 1, 2025 population, 2024–2025 growth and 2025 land-area density.
Population totals use July 1, 2025 observations from PEP Vintage 2025. Change is measured since July 1, 2024. County equivalents are included, including Connecticut planning regions. Missing density is displayed as unavailable, never as zero.
Population table and filters
Whole-dataset downloads| Place | Population · 2025 | Change · 2024–25 | Growth · 2024–25 | People / sq. mi. |
|---|---|---|---|---|
| El Paso CountyColorado · County equivalent · 08041 | 757,040 | +4,684 | +0.62% | 356.0 |
| Denver CountyColorado · County equivalent · 08031 | 740,613 | -978 | -0.13% | 4,838.3 |
| Arapahoe CountyColorado · County equivalent · 08005 | 673,820 | -1,940 | -0.29% | 844.5 |
| Jefferson CountyColorado · County equivalent · 08059 | 580,451 | +92 | +0.02% | 759.3 |
| Adams CountyColorado · County equivalent · 08001 | 554,668 | +5,411 | +0.99% | 475.4 |
| Douglas CountyColorado · County equivalent · 08035 | 399,396 | +6,345 | +1.61% | 475.0 |
| Weld CountyColorado · County equivalent · 08123 | 378,426 | +7,146 | +1.92% | 95.0 |
| Larimer CountyColorado · County equivalent · 08069 | 377,292 | +3,092 | +0.83% | 145.4 |
| Boulder CountyColorado · County equivalent · 08013 | 328,560 | -925 | -0.28% | 452.3 |
| Pueblo CountyColorado · County equivalent · 08101 | 169,277 | -885 | -0.52% | 70.9 |
| Mesa CountyColorado · County equivalent · 08077 | 162,845 | +1,445 | +0.90% | 48.9 |
| Broomfield CountyColorado · County equivalent · 08014 | 79,174 | +771 | +0.98% | 2,401.6 |
| Garfield CountyColorado · County equivalent · 08045 | 63,474 | -346 | -0.54% | 21.5 |
| La Plata CountyColorado · County equivalent · 08067 | 56,898 | -32 | -0.06% | 33.7 |
| Eagle CountyColorado · County equivalent · 08037 | 54,291 | -344 | -0.63% | 32.2 |
| Fremont CountyColorado · County equivalent · 08043 | 50,039 | +35 | +0.07% | 32.6 |
| Montrose CountyColorado · County equivalent · 08085 | 44,591 | -96 | -0.21% | 19.9 |
| Delta CountyColorado · County equivalent · 08029 | 32,178 | -116 | -0.36% | 28.2 |
| Summit CountyColorado · County equivalent · 08117 | 31,517 | -126 | -0.40% | 51.8 |
| Elbert CountyColorado · County equivalent · 08039 | 30,534 | +1,190 | +4.06% | 16.5 |
| Morgan CountyColorado · County equivalent · 08087 | 30,306 | -10 | -0.03% | 23.7 |
| Montezuma CountyColorado · County equivalent · 08083 | 26,678 | -16 | -0.06% | 13.1 |
| Routt CountyColorado · County equivalent · 08107 | 25,329 | -142 | -0.56% | 10.7 |
| Teller CountyColorado · County equivalent · 08119 | 24,756 | +13 | +0.05% | 44.4 |
| Chaffee CountyColorado · County equivalent · 08015 | 20,831 | +35 | +0.17% | 20.6 |
| Logan CountyColorado · County equivalent · 08075 | 20,654 | -36 | -0.17% | 11.2 |
| Park CountyColorado · County equivalent · 08093 | 18,314 | -35 | -0.19% | 8.3 |
| Otero CountyColorado · County equivalent · 08089 | 17,683 | -205 | -1.15% | 14.0 |
| Gunnison CountyColorado · County equivalent · 08051 | 17,439 | +32 | +0.18% | 5.4 |
| Alamosa CountyColorado · County equivalent · 08003 | 16,688 | -3 | -0.02% | 23.1 |
| Pitkin CountyColorado · County equivalent · 08097 | 16,625 | -141 | -0.84% | 17.1 |
| Grand CountyColorado · County equivalent · 08049 | 16,496 | +213 | +1.31% | 8.9 |
| Las Animas CountyColorado · County equivalent · 08071 | 14,391 | -120 | -0.83% | 3.0 |
| Archuleta CountyColorado · County equivalent · 08007 | 14,306 | +172 | +1.22% | 10.6 |
| Moffat CountyColorado · County equivalent · 08081 | 13,122 | -182 | -1.37% | 2.8 |
| Prowers CountyColorado · County equivalent · 08099 | 11,884 | -20 | -0.17% | 7.3 |
| Rio Grande CountyColorado · County equivalent · 08105 | 11,087 | -56 | -0.50% | 12.2 |
| Yuma CountyColorado · County equivalent · 08125 | 9,896 | +23 | +0.23% | 4.2 |
| Clear Creek CountyColorado · County equivalent · 08019 | 8,994 | -29 | -0.32% | 22.8 |
| San Miguel CountyColorado · County equivalent · 08113 | 7,753 | -65 | -0.83% | 6.0 |
| Lake CountyColorado · County equivalent · 08065 | 7,552 | +81 | +1.08% | 20.0 |
| Conejos CountyColorado · County equivalent · 08021 | 7,529 | +5 | +0.07% | 5.8 |
| Kit Carson CountyColorado · County equivalent · 08063 | 7,069 | +42 | +0.60% | 3.3 |
| Huerfano CountyColorado · County equivalent · 08055 | 7,011 | +18 | +0.26% | 4.4 |
| Saguache CountyColorado · County equivalent · 08109 | 6,732 | +46 | +0.69% | 2.1 |
| Rio Blanco CountyColorado · County equivalent · 08103 | 6,683 | -109 | -1.60% | 2.1 |
| Gilpin CountyColorado · County equivalent · 08047 | 6,073 | +118 | +1.98% | 40.5 |
| Bent CountyColorado · County equivalent · 08011 | 5,716 | -29 | -0.50% | 3.8 |
| Crowley CountyColorado · County equivalent · 08025 | 5,677 | +29 | +0.51% | 7.2 |
| Lincoln CountyColorado · County equivalent · 08073 | 5,645 | +43 | +0.77% | 2.2 |
Use these comparisons consistently
A larger population does not necessarily mean faster growth. Absolute change measures the number of residents gained or lost; percentage change divides that difference by the starting population. The percentage column here covers one July-to-July interval, rather than a decade or a partial calendar year. Percent growth is suppressed where the starting population is zero.
Density divides the unrounded July 1, 2025 population by matching 2025 Gazetteer land area. It is measured in people per square mile and excludes water area. These geographic averages depend on the size and definition of each unit, so a county’s density is not directly comparable to a built-up city neighborhood.
County-equivalent names and units vary by state. Connecticut planning regions are represented in the current series; linking older county series requires a documented relationship. Incorporated places may cross county boundaries and do not form an exhaustive county breakdown.
Exports contain the current page’s visible rows after filtering, with reference date and release metadata. Use whole-dataset downloads for every row or select a compatible comparison to inspect a longer interval. The initial pep-2025-r1 snapshot remains reproducible when future releases are added.