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Which counties in Colorado are people leaving?

30 of the 61 ranked counties in Colorado had more residents move away to other U.S. counties than move in during 2025. Jackson County had the largest net outflow for its size: 52.8 per 1,000 residents (−64 people). In people, Arapahoe County had the largest net outflow (−9,859).

Net out-migration does not always mean fewer residents: 13 of these 30 counties still had more residents in 2025 than in 2020.

Data as of 2025 · updated

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All 30 Colorado counties with net out-migration

Counties with the most out-migration in Colorado
RankCountyPer 1,000 residents, 2025Net movers 2025ResidentsPopulation change 2020–25
1Jackson County−52.8−641,211−12.2%
2Rio Blanco County−17.1−1146,683+2.5%
3Moffat County−17.0−22313,122−1.1%
4Arapahoe County−14.6−9,859673,820+2.8%
5Summit County−14.2−44831,517+0.9%
6San Miguel County−13.3−1037,753−3.7%
7Eagle County−12.2−66254,291−2.5%
8Garfield County−12.1−77063,474+2.7%
9Pitkin County−11.9−19816,625−4.3%
10Routt County−11.4−28925,329+2.0%
11Phillips County−11.1−494,420−2.4%
12Denver County−10.8−8,023740,613+3.2%
13Baca County−9.9−333,347−3.8%
14Morgan County−8.2−24830,306+4.2%
15Yuma County−7.5−749,896−0.8%
16Boulder County−6.8−2,248328,560−0.7%
17Otero County−6.7−11917,683−5.2%
18Prowers County−5.6−6711,884−1.1%
19Pueblo County−3.8−648169,277+0.6%
20Park County−3.4−6318,314+5.1%
21Las Animas County−3.4−4914,391−0.7%
22Jefferson County−3.3−1,904580,451−0.5%
23Washington County−3.0−144,732−1.6%
24Rio Grande County−2.3−2511,087−3.9%
25Sedgwick County−2.2−52,247−6.0%
26Gunnison County−1.8−3217,439+2.9%
27Clear Creek County−1.7−158,994−3.9%
28Alamosa County−0.9−1516,688+1.9%
29La Plata County−0.4−2556,898+2.2%
30Delta County−0.0−132,178+3.6%

How this is ranked

Counties where more residents moved away to other U.S. counties than moved in (negative net domestic migration in the Census Bureau's population estimates for 2025), per 1,000 residents, largest net outflow first. Moves from and to other countries, births and deaths are not counted. 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 are the most people leaving?

For its size, Jackson County: net domestic migration of −52.8 per 1,000 residents in 2025 (−64 people; Census Bureau population estimates). Next: Rio Blanco County (−17.1) and Moffat County (−17.0).

How many counties in Colorado have more people moving out than in?

30 of the 61 ranked counties in Colorado had more residents move away to other U.S. counties than move in during 2025.

Does net out-migration mean a county is losing population?

Not always. Net domestic migration counts moves between U.S. counties only; births, deaths and international migration also change the total. 13 of these 30 counties still had more residents in 2025 than in 2020.

More county rankings for Colorado

Counties with the most out-migration in other states

Across the U.S.