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%−77%

02Strafford County, NHNH135,043+3.2%−59%

03Rockingham County, NHNH324,077+3.2%−75%

04Merrimack County, NHNH158,078+2.8%−79%

05Hillsborough County, NHNH433,415+2.5%−81%

06Cheshire County, NHNH78,269+2.4%−55%

07Grafton County, NHNH93,225+2.3%−75%

08Belknap County, NHNH65,147+2.3%−84%

09Sullivan County, NHNH43,961+2.1%−57%

10Coos County, NHNH31,343+0.2%−105%

SHOWING 1–10 OF 10

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