RANKING · 2025 ACS · 10 SHOWN OF 10

Most sparsely populated, New Hampshire counties

New Hampshire counties with the fewest residents per square mile (2023). This list covers the 10 counties in New Hampshire that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most densely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Coos County, NHNH31,34317−5%

02Grafton County, NHNH93,22555+14%

03Carroll County, NHNH52,78457+21%

04Sullivan County, NHNH43,96182+9%

05Cheshire County, NHNH78,269111+6%

06Belknap County, NHNH65,147162+16%

07Merrimack County, NHNH158,078169+16%

08Strafford County, NHNH135,043367+20%

09Rockingham County, NHNH324,077466+17%

10Hillsborough County, NHNH433,415494+14%

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES