Data / Rankings / Population / Counties in New Hampshire

Counties in New Hampshire by population

Hillsborough County had the highest population of 10 counties in 2022, at 426,329. Coos County had the lowest, at 31,444. The median was 85,149 and the figure for New Hampshire was 1.4 million. Source: the U.S. Census Bureau.

Highest426,329Hillsborough County
Lowest31,444Coos County
Median85,14910 counties
New Hampshire1,396,647History

All counties, 2022

CSVChart (SVG)

Hillsborough CountyHillsborough County: 426,329 persons426,329Rockingham CountyRockingham County: 319,262 persons319,262Merrimack CountyMerrimack County: 156,220 persons156,220Strafford CountyStrafford County: 132,469 persons132,469Grafton CountyGrafton County: 92,918 persons92,918Cheshire CountyCheshire County: 77,380 persons77,380Belknap CountyBelknap County: 64,643 persons64,643Carroll CountyCarroll County: 52,093 persons52,093Sullivan CountySullivan County: 43,889 persons43,889Coos CountyCoos County: 31,444 persons31,444
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2022
persons		Change on 2021
1Hillsborough County426,329+0.4%
2Rockingham County319,262+0.3%
3Merrimack County156,220+1%
4Strafford County132,469+0.6%
5Grafton County92,918+2.7%
6Cheshire County77,380+0.7%
7Belknap County64,6430%
8Carroll County52,093+0.7%
9Sullivan County43,889+0.6%
10Coos County31,444+0.1%

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.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in New Hampshire by population using official data, and cite the source.
rank_places {"indicator":"population","level":"province","within":"New Hampshire","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population&level=province&within=New%20Hampshire&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest population?

Hillsborough County, with 426,329 in 2022, according to the U.S. Census Bureau.

Which county has the lowest population?

Coos County, with 31,444 in 2022.

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