RANKING · 2020 CENSUS · 24 SHOWN OF 24

Largest by population, Maryland counties · 2020

The most populous us counties as of the 2023 estimates. This list covers the 24 counties in Maryland that qualify, ranked against each other statewide.

MarylandAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPTOTAL POPULATIONVS 2000

01Montgomery County, MDMD1,074,5821,062,061+22%

02Prince George's County, MDMD970,374967,201+21%

03Baltimore County, MDMD847,650854,535+13%

04Anne Arundel County, MDMD603,380588,261+20%

05Baltimore, MDMD569,997585,708−10%

06Howard County, MDMD339,183332,317+34%

07Frederick County, MDMD302,883271,717+39%

08Harford County, MDMD266,446260,924+19%

09Carroll County, MDMD176,677172,891+15%

10Charles County, MDMD176,593166,617+38%

11Washington County, MDMD157,731154,705+17%

12St. Mary's County, MDMD116,692113,777+32%

13Cecil County, MDMD107,131103,725+21%

14Wicomico County, MDMD106,899103,588+22%

15Calvert County, MDMD94,48492,783+24%

16Allegany County, MDMD66,84868,106−9%

17Worcester County, MDMD54,45952,460+13%

18Queen Anne's County, MDMD54,44849,874+23%

19Talbot County, MDMD38,23837,526+11%

20Caroline County, MDMD34,11633,293+12%

21Dorchester County, MDMD33,62832,531+6%

22Garrett County, MDMD28,37028,806−3%

23Somerset County, MDMD24,97324,620−1%

24Kent County, MDMD19,56519,198+0%

SHOWING 1–24 OF 24

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES