Which counties in Colorado are losing population?
22 of the 61 ranked counties in Colorado had fewer residents in 2025 than in 2020. Jackson County lost the largest share, down 12.2% (−168 people). Jefferson County lost the most residents (−2,680).
Of the 22 counties that lost residents between 2020 and 2025, the largest factor was natural change (more deaths than births) in 8 and net domestic migration (more residents moving to other U.S. counties than arriving) in 14 (Census Bureau components of population change).
Data as of 2025 · updated
All 22 Colorado counties that lost residents
| Rank | County | Change 2020–25 | Residents lost 2020–25 | Residents 2025 | Largest factor 2020–25 |
|---|---|---|---|---|---|
| 1 | Jackson County | −12.2% | −168 | 1,211 | Domestic migration (−160) |
| 2 | Sedgwick County | −6.0% | −144 | 2,247 | Natural change (−127) |
| 3 | Otero County | −5.2% | −976 | 17,683 | Domestic migration (−538) |
| 4 | Pitkin County | −4.3% | −738 | 16,625 | Domestic migration (−1,385) |
| 5 | Rio Grande County | −3.9% | −451 | 11,087 | Domestic migration (−266) |
| 6 | Clear Creek County | −3.9% | −364 | 8,994 | Domestic migration (−279) |
| 7 | Baca County | −3.8% | −131 | 3,347 | Natural change (−129) |
| 8 | San Miguel County | −3.7% | −300 | 7,753 | Domestic migration (−484) |
| 9 | Kiowa County | −2.8% | −41 | 1,412 | Domestic migration (−38) |
| 10 | Logan County | −2.7% | −567 | 20,654 | Natural change (−458) |
| 11 | Eagle County | −2.5% | −1,366 | 54,291 | Domestic migration (−4,131) |
| 12 | Phillips County | −2.4% | −108 | 4,420 | Domestic migration (−146) |
| 13 | Cheyenne County | −1.9% | −33 | 1,713 | Natural change (−37) |
| 14 | Washington County | −1.6% | −78 | 4,732 | Natural change (−80) |
| 15 | Moffat County | −1.1% | −145 | 13,122 | Domestic migration (−347) |
| 16 | Prowers County | −1.1% | −128 | 11,884 | Domestic migration (−338) |
| 17 | Yuma County | −0.8% | −79 | 9,896 | Domestic migration (−677) |
| 18 | Boulder County | −0.7% | −2,422 | 328,560 | Domestic migration (−10,148) |
| 19 | Las Animas County | −0.7% | −100 | 14,391 | Natural change (−508) |
| 20 | Crowley County | −0.5% | −30 | 5,677 | Natural change (−163) |
| 21 | Jefferson County | −0.5% | −2,680 | 580,451 | Domestic migration (−12,277) |
| 22 | Lincoln County | −0.4% | −21 | 5,645 | Natural change (−37) |
How this is ranked
Counties whose Census Bureau resident population estimate for July 1, 2025 is lower than for July 1, 2020, steepest percentage decline first. The largest factor is the most negative of natural change (births minus deaths), net domestic migration and net international migration over the same years (Census Bureau components of population change). Counties with fewer than 1,000 residents, or without a figure for the same period as the others, are left out, as on every ranking.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025). Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how ranks and figures are built. More on every layer: data sources and licences.
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Questions
Which county in Colorado is losing population fastest?
Jackson County: down 12.2% between 2020 and 2025, to 1,211 residents (−168 people; Census Bureau population estimates). Next: Sedgwick County (−6.0%) and Otero County (−5.2%).
How many counties in Colorado are losing population?
22 of the 61 ranked counties in Colorado had fewer residents in 2025 than in 2020; the other 39 grew or held steady.
Why are counties in Colorado losing population?
Of the 22 counties that lost residents between 2020 and 2025, the largest factor was natural change (more deaths than births) in 8 and net domestic migration (more residents moving to other U.S. counties than arriving) in 14 (Census Bureau components of population change).
More county rankings for Colorado
Counties losing population in other states
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Florida
- Georgia
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maryland
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- South Carolina
- South Dakota
- Tennessee
- Texas
- Vermont
- Virginia
- West Virginia
- Wisconsin
- Wyoming