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.

Flip the list · Fastest shrinking, US counties →

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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%−50%

02Strafford County, NHNH135,043+6.3%−18%

03Belknap County, NHNH65,147+6.0%−58%

04Hillsborough County, NHNH433,415+5.5%−58%

05Merrimack County, NHNH158,078+5.0%−63%

06Carroll County, NHNH52,784+4.8%−79%

07Grafton County, NHNH93,225+2.2%−75%

08Cheshire County, NHNH78,269-0.9%−116%

09Sullivan County, NHNH43,961-1.6%−132%

10Coos County, NHNH31,343-5.4%+10%

SHOWING 1–10 OF 10

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