RANKING · 2025 ESTIMATES · 10 SHOWN OF 10

Most densely populated, New Hampshire counties

New Hampshire counties ranked by residents per square mile (2025). This list covers the 10 counties in New Hampshire that qualify, ranked against each other statewide.

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RELATEDLargest by population Fastest growing Fastest shrinking Most population gained Most population lost Most sparsely populated

RANKPLACESTATEPOPPOPULATION DENSITYVS –

01Hillsborough County, NHNH433,415494–

02Rockingham County, NHNH324,077466–

03Strafford County, NHNH135,043367–

04Merrimack County, NHNH158,078169–

05Belknap County, NHNH65,147162–

06Cheshire County, NHNH78,269111–

07Sullivan County, NHNH43,96182–

08Carroll County, NHNH52,78457–

09Grafton County, NHNH93,22555–

10Coos County, NHNH31,34317–

SHOWING 1–10 OF 10

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES