Data / Rankings / Population / Counties in Maryland

Counties in Maryland by population, 2025

Montgomery County had the highest population of 24 counties in 2025, at 1.07 million. Kent County had the lowest, at 19,565. The median was 111,912 and the figure for Maryland was 6.27 million. Source: the U.S. Census Bureau.

Highest1,074,582Montgomery County
Lowest19,565Kent County
Median111,91224 counties
Maryland6,265,347History

All counties, 2025

CSVChart (SVG)

Montgomery CountyMontgomery County: 1,074,582 persons1,074,582Prince George's CountyPrince George's County: 970,374 persons970,374Baltimore CountyBaltimore County: 847,650 persons847,650Anne Arundel CountyAnne Arundel County: 603,380 persons603,380Baltimore cityBaltimore city: 569,997 persons569,997Howard CountyHoward County: 339,183 persons339,183Frederick CountyFrederick County: 302,883 persons302,883Harford CountyHarford County: 266,446 persons266,446Carroll CountyCarroll County: 176,677 persons176,677Charles CountyCharles County: 176,593 persons176,593Washington CountyWashington County: 157,731 persons157,731St. Mary's CountySt. Mary's County: 116,692 persons116,692Cecil CountyCecil County: 107,131 persons107,131Wicomico CountyWicomico County: 106,899 persons106,899Calvert CountyCalvert County: 94,484 persons94,484Allegany CountyAllegany County: 66,848 persons66,848Worcester CountyWorcester County: 54,459 persons54,459Queen Anne's CountyQueen Anne's County: 54,448 persons54,448Talbot CountyTalbot County: 38,238 persons38,238Caroline CountyCaroline County: 34,116 persons34,116Dorchester CountyDorchester County: 33,628 persons33,628Garrett CountyGarrett County: 28,370 persons28,370Somerset CountySomerset County: 24,973 persons24,973Kent CountyKent County: 19,565 persons19,565
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2025
persons		Change on 2024
1Montgomery County1,074,582+0.1%
2Prince George's County970,374+0.6%
3Baltimore County847,650-0.1%
4Anne Arundel County603,380+0.4%
5Baltimore city569,997-0%
6Howard County339,183+0.4%
7Frederick County302,883+1.3%
8Harford County266,446+0.3%
9Carroll County176,677-0.1%
10Charles County176,593+1.2%
11Washington County157,731+0.4%
12St. Mary's County116,692+0.4%
13Cecil County107,131+0.5%
14Wicomico County106,899+0.2%
15Calvert County94,484-0.1%
16Allegany County66,848-0.2%
17Worcester County54,459+0.1%
18Queen Anne's County54,448+1.4%
19Talbot County38,238-0.1%
20Caroline County34,116+0.2%
21Dorchester County33,628+1.3%
22Garrett County28,370-0.2%
23Somerset County24,973+0.9%
24Kent County19,565+0.2%

Other periods

About this ranking

Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.

For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

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Questions

Which county has the highest population?

Montgomery County, with 1.07 million in 2025, according to the U.S. Census Bureau.

Which county has the lowest population?

Kent County, with 19,565 in 2025.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). Retrieved 2026-10-08.

Population: other rankings

Counties in Maryland: more rankings