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. The median across all 24 is +3,026. Biggest climber in the top 100 since 2020: Queen Anne's County, MD, up 8 places to #7.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01▲5Frederick County, MDMD302,883+31,166−31%

02▲1Anne Arundel County, MDMD603,380+15,119−76%

03▼1Montgomery County, MDMD1,074,582+12,521−89%

04▲3Charles County, MDMD176,593+9,976−49%

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

06▲2Harford County, MDMD266,446+5,522−85%

07▲8Queen Anne's County, MDMD54,448+4,574−31%

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

09▲5Cecil County, MDMD107,131+3,406−77%

10▲2Wicomico County, MDMD106,899+3,311−68%

11▼10Prince George's County, MDMD970,374+3,173−96%

12▼2Washington County, MDMD157,731+3,026−71%

13▼4St. Mary's County, MDMD116,692+2,915−72%

14▲2Worcester County, MDMD54,459+1,999−83%

15▼2Calvert County, MDMD94,484+1,701−93%

16▲2Dorchester County, MDMD33,628+1,097+150%

17Caroline County, MDMD34,116+823−70%

18▲1Talbot County, MDMD38,238+712−78%

19▲1Kent County, MDMD19,565+367−73%

20▲2Somerset County, MDMD24,973+353−73%

21Garrett County, MDMD28,370-436−126%

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

23▼19Baltimore County, MDMD847,650-6,885−111%

24Baltimore, MDMD569,997-15,711−81%

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES