RANKING · 2025 ESTIMATES · 24 SHOWN OF 24

Largest by population, Maryland counties

The most populous Maryland counties as of the 2025 population estimates. This list covers the 24 counties in Maryland that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS 2000

01Montgomery County, MDMD1,074,582+23%

02Prince George's County, MDMD970,374+21%

03Baltimore County, MDMD847,650+12%

04Anne Arundel County, MDMD603,380+23%

05Baltimore, MDMD569,997−12%

06Howard County, MDMD339,183+37%

07Frederick County, MDMD302,883+55%

08Harford County, MDMD266,446+22%

09Carroll County, MDMD176,677+17%

10Charles County, MDMD176,593+46%

11Washington County, MDMD157,731+20%

12St. Mary's County, MDMD116,692+35%

13Cecil County, MDMD107,131+25%

14Wicomico County, MDMD106,899+26%

15Calvert County, MDMD94,484+27%

16Allegany County, MDMD66,848−11%

17Worcester County, MDMD54,459+17%

18Queen Anne's County, MDMD54,448+34%

19Talbot County, MDMD38,238+13%

20Caroline County, MDMD34,116+15%

21Dorchester County, MDMD33,628+10%

22Garrett County, MDMD28,370−5%

23Somerset County, MDMD24,973+1%

24Kent County, MDMD19,565+2%

SHOWING 1–24 OF 24

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