RANKING · 2000 CENSUS · 10 SHOWN OF 10

Fastest growing, New Hampshire counties · 2000

New Hampshire counties ranked by population growth since the prior decennial census. This list covers the 10 counties in New Hampshire that qualify, ranked against each other statewide.

Flip the list · Fastest shrinking, US counties →

New HampshireAll states All rankings

SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest shrinking Most densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR2000 2010 2020

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Carroll County, NHNH52,784+23.3%+0%

02Belknap County, NHNH65,147+14.4%+0%

03Merrimack County, NHNH158,078+13.5%+0%

04Hillsborough County, NHNH433,415+13.3%+0%

05Rockingham County, NHNH324,077+12.8%+0%

06Grafton County, NHNH93,225+9.1%+0%

07Strafford County, NHNH135,043+7.7%+0%

08Cheshire County, NHNH78,269+5.3%+0%

09Sullivan County, NHNH43,961+4.8%+0%

10Coos County, NHNH31,343-4.9%+0%

SHOWING 1–10 OF 10

Download CSV (full list, 10 rows)

UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES