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Which counties in Pennsylvania are people leaving?

26 of the 67 counties in Pennsylvania had more residents move away to other U.S. counties than move in during 2025. Cameron County had the largest net outflow for its size: 16.9 per 1,000 residents (−71 people). In people, Philadelphia County had the largest net outflow (−9,726).

Net out-migration does not always mean fewer residents: 7 of these 26 counties still had more residents in 2025 than in 2020.

Data as of 2025 · updated

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All 26 Pennsylvania counties with net out-migration

Counties with the most out-migration in Pennsylvania
RankCountyPer 1,000 residents, 2025Net movers 2025ResidentsPopulation change 2020–25
1Cameron County−16.9−714,211−7.0%
2Centre County−11.6−1,824157,393−0.4%
3Union County−7.5−31742,313−0.8%
4Huntingdon County−6.5−28143,001−2.4%
5Philadelphia County−6.2−9,7261,574,281−1.7%
6Delaware County−4.7−2,741580,937+0.8%
7Juniata County−4.4−10423,403−0.3%
8Dauphin County−3.8−1,112293,351+2.3%
9McKean County−2.4−9438,984−3.5%
10Potter County−2.4−3815,897−3.0%
11Lancaster County−2.3−1,319563,159+1.9%
12Allegheny County−2.3−2,7851,225,035−2.0%
13Indiana County−2.1−17282,878−0.3%
14Snyder County−2.1−8239,655−0.2%
15Montour County−2.0−3517,868−1.4%
16Cambria County−1.8−231128,968−3.2%
17Lehigh County−1.8−688384,383+2.7%
18Erie County−1.5−390265,832−1.8%
19Warren County−1.3−4837,038−3.8%
20Bucks County−1.1−729647,828+0.3%
21Blair County−0.9−106119,541−2.5%
22Lycoming County−0.6−67112,587−1.3%
23Bedford County−0.5−2347,480−0.2%
24Berks County−0.2−69440,072+2.7%
25Montgomery County−0.1−75877,643+2.4%
26Elk County−0.0−129,926−3.3%

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 Pennsylvania are the most people leaving?

For its size, Cameron County: net domestic migration of −16.9 per 1,000 residents in 2025 (−71 people; Census Bureau population estimates). Next: Centre County (−11.6) and Union County (−7.5).

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

26 of the 67 counties in Pennsylvania 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. 7 of these 26 counties still had more residents in 2025 than in 2020.

More county rankings for Pennsylvania

Counties with the most out-migration in other states

Across the U.S.