RANKING · 2020 CENSUS · 10 SHOWN OF 10

Fastest growing, New Hampshire counties · 2020

New Hampshire counties ranked by population growth from the 2010 census to 2020. 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

01Rockingham County, NHNH324,077+6.4%−6.4 pts

02Strafford County, NHNH135,043+6.3%−1.4 pts

03Belknap County, NHNH65,147+6.0%−8.4 pts

04Hillsborough County, NHNH433,415+5.5%−7.8 pts

05Merrimack County, NHNH158,078+5.0%−8.5 pts

06Carroll County, NHNH52,784+4.8%−18.5 pts

07Grafton County, NHNH93,225+2.2%−6.8 pts

08Cheshire County, NHNH78,269-0.9%−6.1 pts

09Sullivan County, NHNH43,961-1.6%−6.4 pts

10Coos County, NHNH31,343-5.4%−0.5 pts

SHOWING 1–10 OF 10

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS