RANKING · 2025 ESTIMATES · 10 SHOWN OF 10

Fastest shrinking, New Hampshire counties

New Hampshire counties with the steepest population decline 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

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Coos County, NHNH31,343+0.2%+5.2 pts

02Sullivan County, NHNH43,961+2.1%−2.7 pts

03Belknap County, NHNH65,147+2.3%−12.2 pts

04Grafton County, NHNH93,225+2.3%−6.8 pts

05Cheshire County, NHNH78,269+2.4%−2.9 pts

06Hillsborough County, NHNH433,415+2.5%−10.8 pts

07Merrimack County, NHNH158,078+2.8%−10.7 pts

08Rockingham County, NHNH324,077+3.2%−9.7 pts

09Strafford County, NHNH135,043+3.2%−4.5 pts

10Carroll County, NHNH52,784+5.3%−18.0 pts

SHOWING 1–10 OF 10

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