RANKING · 2020 CENSUS · 24 SHOWN OF 24

Most population gained, Maryland counties · 2020

Maryland counties that added the most residents from the 2010 census to 2020, 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

01Prince George's County, MDMD970,374+103,781+44%

02Montgomery County, MDMD1,074,582+90,284−22%

03Anne Arundel County, MDMD603,380+50,605−19%

04Baltimore County, MDMD847,650+49,506−20%

05Howard County, MDMD339,183+45,232−25%

06Frederick County, MDMD302,883+38,332−15%

07Charles County, MDMD176,593+20,066+3%

08Harford County, MDMD266,446+16,098−56%

09St. Mary's County, MDMD116,692+8,626−16%

10Washington County, MDMD157,731+7,275−31%

11Carroll County, MDMD176,677+5,757−79%

12Wicomico County, MDMD106,899+4,855−53%

13Calvert County, MDMD94,484+4,046−83%

14Cecil County, MDMD107,131+2,617−82%

15Queen Anne's County, MDMD54,448+2,076−69%

16Worcester County, MDMD54,459+1,006−91%

17Caroline County, MDMD34,116+227−92%

18Dorchester County, MDMD33,628-87−120%

19Talbot County, MDMD38,238-256−108%

20Kent County, MDMD19,565-999−174%

21Garrett County, MDMD28,370-1,291−176%

22Somerset County, MDMD24,973-1,850−242%

23Allegany County, MDMD66,848-6,981+43531%

24Baltimore, MDMD569,997-35,253−58%

SHOWING 1–24 OF 24

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