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Which counties in Maryland are losing population?

4 of the 24 counties in Maryland had fewer residents in 2025 than in 2020. Baltimore (city) lost the largest share, down 2.3% (−13,298 people).

Of the 4 counties that lost residents between 2020 and 2025, the largest factor was natural change (more deaths than births) in 2 and net domestic migration (more residents moving to other U.S. counties than arriving) in 2 (Census Bureau components of population change).

Data as of 2025 · updated

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All 4 Maryland counties that lost residents

Counties losing population in Maryland
RankCountyChange 2020–25Residents lost 2020–25Residents 2025Largest factor 2020–25
1Baltimore (city)−2.3%−13,298569,997Domestic migration (−27,661)
2Allegany County−1.6%−1,11966,848Natural change (−2,104)
3Garrett County−1.5%−42828,370Natural change (−704)
4Baltimore County−0.7%−5,700847,650Domestic migration (−23,466)

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 Maryland is losing population fastest?

Baltimore (city): down 2.3% between 2020 and 2025, to 569,997 residents (−13,298 people; Census Bureau population estimates). Next: Allegany County (−1.6%) and Garrett County (−1.5%).

How many counties in Maryland are losing population?

4 of the 24 counties in Maryland had fewer residents in 2025 than in 2020; the other 20 grew or held steady.

Why are counties in Maryland losing population?

Of the 4 counties that lost residents between 2020 and 2025, the largest factor was natural change (more deaths than births) in 2 and net domestic migration (more residents moving to other U.S. counties than arriving) in 2 (Census Bureau components of population change).

More county rankings for Maryland

Counties losing population in other states

Across the U.S.