Data / Rankings / Population density / Counties in New Hampshire

Counties in New Hampshire by population density, 2025

Hillsborough County had the highest population density of 10 counties in 2025, at 190.9 inhabitants per km². Coos County had the lowest, at 6.7 inhabitants per km². The median was 52.7 inhabitants per km² and the figure for New Hampshire was 61 inhabitants per km². Source: the U.S. Census Bureau.

Highest190.9Hillsborough County
Lowest6.7Coos County
Median52.710 counties
New Hampshire61History

All counties, 2025

CSVChart (SVG)

Hillsborough CountyHillsborough County: 190.9 inhabitants per km²190.9Rockingham CountyRockingham County: 179.9 inhabitants per km²179.9Strafford CountyStrafford County: 141.9 inhabitants per km²141.9Merrimack CountyMerrimack County: 65.4 inhabitants per km²65.4Belknap CountyBelknap County: 62.6 inhabitants per km²62.6Cheshire CountyCheshire County: 42.8 inhabitants per km²42.8Sullivan CountySullivan County: 31.6 inhabitants per km²31.6Carroll CountyCarroll County: 21.9 inhabitants per km²21.9Grafton CountyGrafton County: 21.1 inhabitants per km²21.1Coos CountyCoos County: 6.7 inhabitants per km²6.7
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2025
inhabitants per km²		Change on 2024
1Hillsborough County190.9+0.7%
2Rockingham County179.9+0.6%
3Strafford County141.9+0.5%
4Merrimack County65.4+0.3%
5Belknap County62.6-0%
6Cheshire County42.8+0.1%
7Sullivan County31.6+0.1%
8Carroll County21.9+0.4%
9Grafton County21.1+0.2%
10Coos County6.7-0.1%

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?

Hillsborough County, with 190.9 inhabitants per km² in 2025, according to the U.S. Census Bureau.

Which county has the lowest population density?

Coos County, with 6.7 inhabitants per km² 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, 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