RANKING · 2025 ESTIMATES · 10 SHOWN OF 10

Fastest growing, New Hampshire counties

New Hampshire counties ranked by population growth from the 2020 census to 2025. 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 shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Carroll County, NHNH52,784+5.3%−18.0 pts

02Strafford County, NHNH135,043+3.2%−4.5 pts

03Rockingham County, NHNH324,077+3.2%−9.7 pts

04Merrimack County, NHNH158,078+2.8%−10.7 pts

05Hillsborough County, NHNH433,415+2.5%−10.8 pts

06Cheshire County, NHNH78,269+2.4%−2.9 pts

07Grafton County, NHNH93,225+2.3%−6.8 pts

08Belknap County, NHNH65,147+2.3%−12.2 pts

09Sullivan County, NHNH43,961+2.1%−2.7 pts

10Coos County, NHNH31,343+0.2%+5.2 pts

SHOWING 1–10 OF 10

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU POPULATION ESTIMATES