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 2023, at 188.3 inhabitants per km². Coos County had the lowest, at 6.7 inhabitants per km². The median was 52.5 inhabitants per km² and the figure for New Hampshire was 60.4 inhabitants per km². Source: the U.S. Census Bureau.

Highest188.3Hillsborough County
Lowest6.7Coos County
Median52.510 counties
New Hampshire60.4History

All counties, 2023

CSVChart (SVG)

Hillsborough CountyHillsborough County: 188.3 inhabitants per km²188.3Rockingham CountyRockingham County: 177.9 inhabitants per km²177.9Strafford CountyStrafford County: 140.4 inhabitants per km²140.4Merrimack CountyMerrimack County: 64.9 inhabitants per km²64.9Belknap CountyBelknap County: 62.5 inhabitants per km²62.5Cheshire CountyCheshire County: 42.4 inhabitants per km²42.4Sullivan CountySullivan County: 31.6 inhabitants per km²31.6Carroll CountyCarroll County: 21.7 inhabitants per km²21.7Grafton CountyGrafton County: 21 inhabitants per km²21Coos 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

RankCounties2023
inhabitants per km²		Change on 2022
1Hillsborough County188.3+0.3%
2Rockingham County177.9+0.4%
3Strafford County140.4+0.8%
4Merrimack County64.9+0.4%
5Belknap County62.5+0.6%
6Cheshire County42.4+0.4%
7Sullivan County31.6+0.3%
8Carroll County21.7+0.6%
9Grafton County21-0.2%
10Coos County6.7-0.6%

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 188.3 inhabitants per km² in 2023, according to the U.S. Census Bureau.

Which county has the lowest population density?

Coos County, with 6.7 inhabitants per km² in 2023.

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