Data / Rankings / Population / Counties in New Hampshire

Counties in New Hampshire by population

Hillsborough County had the highest population of 10 counties in 2024, at 430,442. Coos County had the lowest, at 31,377. The median was 85,581 and the figure for New Hampshire was 1.41 million. Source: the U.S. Census Bureau.

Highest430,442Hillsborough County
Lowest31,377Coos County
Median85,58110 counties
New Hampshire1,408,518History

All counties, 2024

CSVChart (SVG)

Hillsborough CountyHillsborough County: 430,442 persons430,442Rockingham CountyRockingham County: 322,001 persons322,001Merrimack CountyMerrimack County: 157,547 persons157,547Strafford CountyStrafford County: 134,331 persons134,331Grafton CountyGrafton County: 92,993 persons92,993Cheshire CountyCheshire County: 78,168 persons78,168Belknap CountyBelknap County: 65,169 persons65,169Carroll CountyCarroll County: 52,566 persons52,566Sullivan CountySullivan County: 43,924 persons43,924Coos CountyCoos County: 31,377 persons31,377
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2024
persons		Change on 2023
1Hillsborough County430,442+0.7%
2Rockingham County322,001+0.5%
3Merrimack County157,547+0.4%
4Strafford County134,331+0.6%
5Grafton County92,993+0.2%
6Cheshire County78,168+0.6%
7Belknap County65,169+0.2%
8Carroll County52,566+0.3%
9Sullivan County43,924-0.2%
10Coos County31,377+0.4%

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 New Hampshire by population using official data, and cite the source.
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Questions

Which county has the highest population?

Hillsborough County, with 430,442 in 2024, according to the U.S. Census Bureau.

Which county has the lowest population?

Coos County, with 31,377 in 2024.

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 New Hampshire: more rankings