New Hampshire Population By County (2018)
Created on February 25, 2020.
Data Updated on May 9, 2021.

According to the US Census Bureau population estimates, there were 1,353,465 people living in New Hampshire in 2018. Hillsborough County was the most populated county with 414,630 residents, followed by Rockingham County with 308,287 residents, and Merrimack County with 150,650 residents. Coos County with a population of 31,486 was the least populated county in New Hampshire in 2018.

Use the map below to interactively explore the population of each county in New Hampshire in 2018. The data can also be explored further by sorting and filtering with the table below.

Hover/Click on the counties to see the values.
New Hampshire Population By County (2018)
Table of New Hampshire Population By County (2018)
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County Population % of State Population
Belknap 61,145 4.52%
Carroll 48,754 3.60%
Cheshire 75,901 5.61%
Coos 31,486 2.33%
Grafton 89,701 6.63%
Hillsborough 414,630 30.64%
Merrimack 150,650 11.13%
Rockingham 308,287 22.78%
Strafford 129,797 9.59%
Sullivan 43,114 3.19%