Data / Rankings / Population density / Counties in New Hampshire

Counties in New Hampshire by population density

Hillsborough County had the highest population density of 10 counties in 2021, at 187 inhabitants per km². Coos County had the lowest, at 6.8 inhabitants per km². The median was 52 inhabitants per km² and the figure for New Hampshire was 59.8 inhabitants per km². Source: the U.S. Census Bureau.

Highest187Hillsborough County
Lowest6.8Coos County
Median5210 counties
New Hampshire59.8History

All counties, 2021

CSVChart (SVG)

Hillsborough CountyHillsborough County: 187 inhabitants per km²187Rockingham CountyRockingham County: 176.7 inhabitants per km²176.7Strafford CountyStrafford County: 138.3 inhabitants per km²138.3Merrimack CountyMerrimack County: 64 inhabitants per km²64Belknap CountyBelknap County: 62.1 inhabitants per km²62.1Cheshire CountyCheshire County: 42 inhabitants per km²42Sullivan CountySullivan County: 31.3 inhabitants per km²31.3Carroll CountyCarroll County: 21.4 inhabitants per km²21.4Grafton CountyGrafton County: 20.5 inhabitants per km²20.5Coos CountyCoos County: 6.8 inhabitants per km²6.8
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2021
inhabitants per km²		Change on 2020
1Hillsborough County187+0.4%
2Rockingham County176.7+1.2%
3Strafford County138.3+0.4%
4Merrimack County64+0.4%
5Belknap County62.1+1.3%
6Cheshire County42+0.4%
7Sullivan County31.3+1.3%
8Carroll County21.4+3%
9Grafton County20.5-0.7%
10Coos County6.8+0.5%

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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Rank Counties in New Hampshire by population density using official data, and cite the source.
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Questions

Which county has the highest population density?

Hillsborough County, with 187 inhabitants per km² in 2021, according to the U.S. Census Bureau.

Which county has the lowest population density?

Coos County, with 6.8 inhabitants per km² 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, 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 New Hampshire: more rankings