RANKING · 2010 CENSUS · 10 SHOWN OF 10

Most densely populated, New Hampshire counties · 2010

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

Flip the list · Most sparsely populated, US counties →

New HampshireAll states All rankings

SAME RANKING BYCities States Metros

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

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, NHNH31,34318−0%

SHOWING 1–10 OF 10

Download CSV (full list, 10 rows)

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