Data / Rankings / Population / Counties in Maryland

Counties in Maryland by population

Montgomery County had the highest population of 24 counties in 2020, at 1.06 million. Kent County had the lowest, at 19,125. The median was 108,895 and the figure for Maryland was 6.18 million. Source: the U.S. Census Bureau.

Highest1,060,926Montgomery County
Lowest19,125Kent County
Median108,89524 counties
Maryland6,178,387History

All counties, 2020

CSVChart (SVG)

Montgomery CountyMontgomery County: 1,060,926 persons1,060,926Prince George's CountyPrince George's County: 965,578 persons965,578Baltimore CountyBaltimore County: 853,350 persons853,350Anne Arundel CountyAnne Arundel County: 593,487 persons593,487Baltimore cityBaltimore city: 583,295 persons583,295Howard CountyHoward County: 332,809 persons332,809Frederick CountyFrederick County: 272,767 persons272,767Harford CountyHarford County: 261,235 persons261,235Carroll CountyCarroll County: 172,923 persons172,923Charles CountyCharles County: 166,734 persons166,734Washington CountyWashington County: 154,699 persons154,699St. Mary's CountySt. Mary's County: 113,992 persons113,992Cecil CountyCecil County: 103,798 persons103,798Wicomico CountyWicomico County: 103,577 persons103,577Calvert CountyCalvert County: 92,922 persons92,922Allegany CountyAllegany County: 67,967 persons67,967Worcester CountyWorcester County: 52,524 persons52,524Queen Anne's CountyQueen Anne's County: 50,039 persons50,039Talbot CountyTalbot County: 37,488 persons37,488Caroline CountyCaroline County: 33,274 persons33,274Dorchester CountyDorchester County: 32,523 persons32,523Garrett CountyGarrett County: 28,798 persons28,798Somerset CountySomerset County: 24,557 persons24,557Kent CountyKent County: 19,125 persons19,125
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2020
persons
1Montgomery County1,060,926
2Prince George's County965,578
3Baltimore County853,350
4Anne Arundel County593,487
5Baltimore city583,295
6Howard County332,809
7Frederick County272,767
8Harford County261,235
9Carroll County172,923
10Charles County166,734
11Washington County154,699
12St. Mary's County113,992
13Cecil County103,798
14Wicomico County103,577
15Calvert County92,922
16Allegany County67,967
17Worcester County52,524
18Queen Anne's County50,039
19Talbot County37,488
20Caroline County33,274
21Dorchester County32,523
22Garrett County28,798
23Somerset County24,557
24Kent County19,125

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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Rank Counties in Maryland by population using official data, and cite the source.
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Questions

Which county has the highest population?

Montgomery County, with 1.06 million in 2020, according to the U.S. Census Bureau.

Which county has the lowest population?

Kent County, with 19,125 in 2020.

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