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Which counties in Idaho are people leaving?

12 of the 43 ranked counties in Idaho had more residents move away to other U.S. counties than move in during 2025. Power County had the largest net outflow for its size: 16.5 per 1,000 residents (−136 people). In people, Madison County had the largest net outflow (−775).

Net out-migration does not always mean fewer residents: 12 of these 12 counties still had more residents in 2025 than in 2020.

Data as of 2025 · updated

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All 12 Idaho counties with net out-migration

Counties with the most out-migration in Idaho
RankCountyPer 1,000 residents, 2025Net movers 2025ResidentsPopulation change 2020–25
1Power County−16.5−1368,246+4.6%
2Fremont County−14.5−20614,208+5.9%
3Madison County−14.0−77555,172+4.2%
4Blaine County−12.3−31425,517+4.8%
5Owyhee County−11.8−14912,661+5.6%
6Elmore County−11.3−33429,465+2.8%
7Lincoln County−8.7−495,603+9.1%
8Latah County−5.5−23241,842+5.6%
9Gooding County−4.3−7016,446+5.1%
10Jerome County−4.0−10626,362+8.6%
11Cassia County−3.4−8926,397+6.6%
12Bingham County−0.9−4451,153+6.4%

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 Idaho are the most people leaving?

For its size, Power County: net domestic migration of −16.5 per 1,000 residents in 2025 (−136 people; Census Bureau population estimates). Next: Fremont County (−14.5) and Madison County (−14.0).

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

12 of the 43 ranked counties in Idaho 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. 12 of these 12 counties still had more residents in 2025 than in 2020.

More county rankings for Idaho

Counties with the most out-migration in other states

Across the U.S.