Data / Rankings / Population density / Counties in Maryland

Counties in Maryland by population density

Baltimore city had the highest population density of 24 counties in 2020, at 2,782.2 inhabitants per km². Garrett County had the lowest, at 17.1 inhabitants per km². The median was 126.6 inhabitants per km² and the figure for Maryland was 245.6 inhabitants per km². Source: the U.S. Census Bureau.

Highest2,782.2Baltimore city
Lowest17.1Garrett County
Median126.624 counties
Maryland245.6History

All counties, 2020

CSVChart (SVG)

Baltimore cityBaltimore city: 2,782.2 inhabitants per km²2,782.2Montgomery CountyMontgomery County: 830.7 inhabitants per km²830.7Prince George's CountyPrince George's County: 772.5 inhabitants per km²772.5Anne Arundel CountyAnne Arundel County: 552.4 inhabitants per km²552.4Baltimore CountyBaltimore County: 550.6 inhabitants per km²550.6Howard CountyHoward County: 512 inhabitants per km²512Harford CountyHarford County: 230.7 inhabitants per km²230.7Calvert CountyCalvert County: 168.3 inhabitants per km²168.3Frederick CountyFrederick County: 159.4 inhabitants per km²159.4Carroll CountyCarroll County: 149.2 inhabitants per km²149.2Charles CountyCharles County: 140.6 inhabitants per km²140.6Washington CountyWashington County: 130.5 inhabitants per km²130.5St. Mary's CountySt. Mary's County: 122.7 inhabitants per km²122.7Cecil CountyCecil County: 115.7 inhabitants per km²115.7Wicomico CountyWicomico County: 106.8 inhabitants per km²106.8Allegany CountyAllegany County: 62.2 inhabitants per km²62.2Talbot CountyTalbot County: 53.9 inhabitants per km²53.9Queen Anne's CountyQueen Anne's County: 52 inhabitants per km²52Worcester CountyWorcester County: 43.3 inhabitants per km²43.3Caroline CountyCaroline County: 40.2 inhabitants per km²40.2Somerset CountySomerset County: 29.7 inhabitants per km²29.7Kent CountyKent County: 26.7 inhabitants per km²26.7Dorchester CountyDorchester County: 23.2 inhabitants per km²23.2Garrett CountyGarrett County: 17.1 inhabitants per km²17.1
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2020
inhabitants per km²
1Baltimore city2,782.2
2Montgomery County830.7
3Prince George's County772.5
4Anne Arundel County552.4
5Baltimore County550.6
6Howard County512
7Harford County230.7
8Calvert County168.3
9Frederick County159.4
10Carroll County149.2
11Charles County140.6
12Washington County130.5
13St. Mary's County122.7
14Cecil County115.7
15Wicomico County106.8
16Allegany County62.2
17Talbot County53.9
18Queen Anne's County52
19Worcester County43.3
20Caroline County40.2
21Somerset County29.7
22Kent County26.7
23Dorchester County23.2
24Garrett County17.1

Other periods

About this ranking

Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.

United States: Census Bureau population estimates for 1 July divided by land area (water excluded) from the latest Census Gazetteer files. US tables often give people per square mile; multiply persons per km² by 2.59 to compare.

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. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.

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Questions

Which county has the highest population density?

Baltimore city, with 2,782.2 inhabitants per km² in 2020, according to the U.S. Census Bureau.

Which county has the lowest population density?

Garrett County, with 17.1 inhabitants per km² 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, Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². Retrieved 2026-10-09.

Population density: other rankings

Counties in Maryland: more rankings