New Hampshire Population By County in 2018
Updated on December 2, 2021.

According to the US Census Bureau population estimates, there were 1,355,064 people living in New Hampshire in 2018. Hillsborough County was the most populated county with 414,917 residents, followed by Rockingham County with 308,377 residents, and Merrimack County with 150,981 residents. Coos County with a population of 31,490 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)
See also Population estimate for other years:
Table of New Hampshire Population By County in 2018
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County Population % of State Population
Belknap 61,242 4.52%
Carroll 48,690 3.59%
Cheshire 75,925 5.60%
Coos 31,490 2.32%
Grafton 90,206 6.66%
Hillsborough 414,917 30.62%
Merrimack 150,981 11.14%
Rockingham 308,377 22.76%
Strafford 130,042 9.60%
Sullivan 43,194 3.19%