RANKING · 2010 CENSUS · 24 SHOWN OF 24

Most population gained, Maryland counties · 2010

Maryland counties that added the most residents from the 2000 census to 2010, by raw count of people rather than percentage. This list covers the 24 counties in Maryland that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Montgomery County, MDMD1,074,582+98,436−15%

02Prince George's County, MDMD970,374+61,905−14%

03Baltimore County, MDMD847,650+50,737−18%

04Anne Arundel County, MDMD603,380+48,000−23%

05Howard County, MDMD339,183+39,243−35%

06Frederick County, MDMD302,883+38,108−15%

07Harford County, MDMD266,446+26,236−28%

08Charles County, MDMD176,593+26,005+34%

09St. Mary's County, MDMD116,692+18,940+85%

10Carroll County, MDMD176,677+16,237−41%

11Washington County, MDMD157,731+15,507+47%

12Cecil County, MDMD107,131+15,157+4%

13Calvert County, MDMD94,484+14,174−39%

14Wicomico County, MDMD106,899+14,089+37%

15Queen Anne's County, MDMD54,448+7,235+9%

16Worcester County, MDMD54,459+4,911−57%

17Talbot County, MDMD38,238+3,970+22%

18Caroline County, MDMD34,116+3,294+20%

19Dorchester County, MDMD33,628+1,944+344%

20Somerset County, MDMD24,973+1,723+32%

21Kent County, MDMD19,565+1,000−26%

22Garrett County, MDMD28,370+251−85%

23Allegany County, MDMD66,848+157−1081%

24Baltimore, MDMD569,997-30,193−64%

SHOWING 1–24 OF 24

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS