RANKING · 2025 ESTIMATES · 24 SHOWN OF 24

Most population gained, Maryland counties

Maryland counties that added the most residents from the 2020 census to 2025, 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

01Frederick County, MDMD302,883+31,166−31%

02Anne Arundel County, MDMD603,380+15,119−76%

03Montgomery County, MDMD1,074,582+12,521−89%

04Charles County, MDMD176,593+9,976−49%

05Howard County, MDMD339,183+6,866−89%

06Harford County, MDMD266,446+5,522−85%

07Queen Anne's County, MDMD54,448+4,574−31%

08Carroll County, MDMD176,677+3,786−86%

09Cecil County, MDMD107,131+3,406−77%

10Wicomico County, MDMD106,899+3,311−68%

11Prince George's County, MDMD970,374+3,173−96%

12Washington County, MDMD157,731+3,026−71%

13St. Mary's County, MDMD116,692+2,915−72%

14Worcester County, MDMD54,459+1,999−83%

15Calvert County, MDMD94,484+1,701−93%

16Dorchester County, MDMD33,628+1,097+150%

17Caroline County, MDMD34,116+823−70%

18Talbot County, MDMD38,238+712−78%

19Kent County, MDMD19,565+367−73%

20Somerset County, MDMD24,973+353−73%

21Garrett County, MDMD28,370-436−126%

22Allegany County, MDMD66,848-1,258+7763%

23Baltimore County, MDMD847,650-6,885−111%

24Baltimore, MDMD569,997-15,711−81%

SHOWING 1–24 OF 24

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES