RANKING · 2020 CENSUS · 10 SHOWN OF 10

Most population lost, New Hampshire counties · 2020

New Hampshire counties that lost the most residents from the 2010 census to 2020, by raw count of people rather than percentage. 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 CHANGEVS 2000

01Coos County, NHNH31,343-1,787+4%

02Sullivan County, NHNH43,961-679−136%

03Cheshire County, NHNH78,269-659−118%

04Grafton County, NHNH93,225+2,000−71%

05Carroll County, NHNH52,784+2,289−72%

06Belknap County, NHNH65,147+3,617−49%

07Merrimack County, NHNH158,078+7,363−55%

08Strafford County, NHNH135,043+7,746−3%

09Rockingham County, NHNH324,077+18,953−40%

10Hillsborough County, NHNH433,415+22,216−50%

SHOWING 1–10 OF 10

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS