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Which counties in Connecticut are people leaving?

4 of the 9 counties in Connecticut had more residents move away to other U.S. counties than move in during 2025. Greater Bridgeport Planning Region had the largest net outflow for its size: 6.1 per 1,000 residents (−2,044 people). In people, Western Connecticut Planning Region had the largest net outflow (−3,667).

Net out-migration does not always mean fewer residents: 4 of these 4 counties still had more residents in 2025 than in 2020.

Data as of 2025 · updated

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All 4 Connecticut counties with net out-migration

Counties with the most out-migration in Connecticut
RankCountyPer 1,000 residents, 2025Net movers 2025ResidentsPopulation change 2020–25
1Greater Bridgeport Planning Region−6.1−2,044337,697+4.1%
2Western Connecticut Planning Region−5.7−3,667640,482+3.5%
3South Central Connecticut Planning Region−2.9−1,672578,741+2.5%
4Capitol Planning Region−0.1−105994,115+3.1%

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 Connecticut are the most people leaving?

For its size, Greater Bridgeport Planning Region: net domestic migration of −6.1 per 1,000 residents in 2025 (−2,044 people; Census Bureau population estimates). Next: Western Connecticut Planning Region (−5.7) and South Central Connecticut Planning Region (−2.9).

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

4 of the 9 counties in Connecticut 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. 4 of these 4 counties still had more residents in 2025 than in 2020.

Counties with the most out-migration in other states

Across the U.S.