RANKING · 2025 ESTIMATES · 24 SHOWN OF 24

Most densely populated, Maryland counties

Maryland counties ranked by residents per square mile (2025). This list covers the 24 counties in Maryland that qualify, ranked against each other statewide. The median across all 24 is 345.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Baltimore, MDMD569,9977,042−12%

02Montgomery County, MDMD1,074,5822,179+23%

03Prince George's County, MDMD970,3742,011+21%

04▲1Anne Arundel County, MDMD603,3801,455+23%

05▼1Baltimore County, MDMD847,6501,417+12%

06Howard County, MDMD339,1831,352+37%

07Harford County, MDMD266,446610+22%

08▲1Frederick County, MDMD302,883458+55%

09▼1Calvert County, MDMD94,484443+27%

10Carroll County, MDMD176,677395+17%

11Charles County, MDMD176,593386+46%

12Washington County, MDMD157,731345+20%

13St. Mary's County, MDMD116,692325+35%

14Cecil County, MDMD107,131309+25%

15Wicomico County, MDMD106,899285+26%

16Allegany County, MDMD66,848158−11%

17▲1Queen Anne's County, MDMD54,448146+34%

18▼1Talbot County, MDMD38,238142+13%

19Worcester County, MDMD54,459116+17%

20Caroline County, MDMD34,116107+15%

21Somerset County, MDMD24,97378+1%

22Kent County, MDMD19,56571+2%

23Dorchester County, MDMD33,62862+10%

24Garrett County, MDMD28,37044−5%

SHOWING 1–24 OF 24

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