Data / Rankings / Population / Counties in Maryland

Counties in Maryland by population

Montgomery County had the highest population of 24 counties in 2021, at 1.06 million. Kent County had the lowest, at 19,227. The median was 109,331 and the figure for Maryland was 6.18 million. Source: the U.S. Census Bureau.

Highest1,055,869Montgomery County
Lowest19,227Kent County
Median109,33124 counties
Maryland6,176,035History

All counties, 2021

CSVChart (SVG)

Montgomery CountyMontgomery County: 1,055,869 persons1,055,869Prince George's CountyPrince George's County: 956,631 persons956,631Baltimore CountyBaltimore County: 850,038 persons850,038Anne Arundel CountyAnne Arundel County: 595,789 persons595,789Baltimore cityBaltimore city: 576,503 persons576,503Howard CountyHoward County: 335,267 persons335,267Frederick CountyFrederick County: 280,520 persons280,520Harford CountyHarford County: 263,245 persons263,245Carroll CountyCarroll County: 174,216 persons174,216Charles CountyCharles County: 168,826 persons168,826Washington CountyWashington County: 154,425 persons154,425St. Mary's CountySt. Mary's County: 114,567 persons114,567Cecil CountyCecil County: 104,094 persons104,094Wicomico CountyWicomico County: 104,073 persons104,073Calvert CountyCalvert County: 94,273 persons94,273Allegany CountyAllegany County: 67,581 persons67,581Worcester CountyWorcester County: 53,377 persons53,377Queen Anne's CountyQueen Anne's County: 50,921 persons50,921Talbot CountyTalbot County: 37,719 persons37,719Caroline CountyCaroline County: 33,444 persons33,444Dorchester CountyDorchester County: 32,596 persons32,596Garrett CountyGarrett County: 28,739 persons28,739Somerset CountySomerset County: 24,095 persons24,095Kent CountyKent County: 19,227 persons19,227
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2021
persons		Change on 2020
1Montgomery County1,055,869-0.5%
2Prince George's County956,631-0.9%
3Baltimore County850,038-0.4%
4Anne Arundel County595,789+0.4%
5Baltimore city576,503-1.2%
6Howard County335,267+0.7%
7Frederick County280,520+2.8%
8Harford County263,245+0.8%
9Carroll County174,216+0.7%
10Charles County168,826+1.3%
11Washington County154,425-0.2%
12St. Mary's County114,567+0.5%
13Cecil County104,094+0.3%
14Wicomico County104,073+0.5%
15Calvert County94,273+1.5%
16Allegany County67,581-0.6%
17Worcester County53,377+1.6%
18Queen Anne's County50,921+1.8%
19Talbot County37,719+0.6%
20Caroline County33,444+0.5%
21Dorchester County32,596+0.2%
22Garrett County28,739-0.2%
23Somerset County24,095-1.9%
24Kent County19,227+0.5%

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 1.06 million in 2021, according to the U.S. Census Bureau.

Which county has the lowest population?

Kent County, with 19,227 in 2021.

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