RANKING · 2000 CENSUS · 10 SHOWN OF 10

Fastest growing, New Hampshire counties · 2000

New Hampshire counties ranked by population growth from the 1990 census to 2000. 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 –

01Carroll County, NHNH52,784+23.3%–

02Belknap County, NHNH65,147+14.4%–

03Merrimack County, NHNH158,078+13.5%–

04Hillsborough County, NHNH433,415+13.3%–

05Rockingham County, NHNH324,077+12.8%–

06Grafton County, NHNH93,225+9.1%–

07Strafford County, NHNH135,043+7.7%–

08Cheshire County, NHNH78,269+5.3%–

09Sullivan County, NHNH43,961+4.8%–

10Coos County, NHNH31,343-4.9%–

SHOWING 1–10 OF 10

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