RANKING · 2010 CENSUS · 10 SHOWN OF 10

Most densely populated, New Hampshire counties · 2010

New Hampshire counties ranked by residents per square mile (2010). This list covers the 10 counties in New Hampshire that qualify, ranked against each other statewide. The median across all 10 is 150.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Hillsborough County, NHNH433,415457+5%

02Rockingham County, NHNH324,077425+6%

03Strafford County, NHNH135,043335+10%

04Merrimack County, NHNH158,078157+8%

05Belknap County, NHNH65,147150+7%

06Cheshire County, NHNH78,269109+4%

07Sullivan County, NHNH43,96181+8%

08Grafton County, NHNH93,22552+9%

09Carroll County, NHNH52,78451+10%

10Coos County, NHNH31,343180%

SHOWING 1–10 OF 10

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS