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RANKING · 2010 CENSUS · 10 SHOWN OF 10

Most population gained, New Hampshire counties · 2010

New Hampshire counties that added the most residents from the 2000 census to 2010, by raw count of people rather than percentage. This list covers the 10 counties in New Hampshire that qualify, ranked against each other statewide.

Flip the list · Most population lost, US counties →
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SAME RANKING BYCitiesStatesMetros
RELATEDLargest by populationFastest growingFastest shrinkingMost population lostMost densely populatedMost sparsely populated
YEAR2000201020202025
Most population gained by state
All USAlaskaAlabamaArkansasArizonaCaliforniaColoradoFloridaGeorgiaIowaIdahoIllinoisIndianaKansasKentuckyLouisianaMassachusettsMarylandMaineMichiganMinnesotaMissouriMississippiMontanaNorth CarolinaNorth DakotaNebraskaNew HampshireNew JerseyNew MexicoNevadaNew YorkOhioOklahomaOregonPennsylvaniaSouth CarolinaSouth DakotaTennesseeTexasUtahVirginiaVermontWashingtonWisconsinWest VirginiaWyoming
RANKPLACESTATEPOPPOPULATION CHANGEVS 2000
01Hillsborough County, NHNH433,415+19,880−56%
02Rockingham County, NHNH324,077+17,864−43%
03Strafford County, NHNH135,043+10,910+36%
04Merrimack County, NHNH158,078+10,220−37%
05Grafton County, NHNH93,225+7,375+8%
06Carroll County, NHNH52,784+4,152−50%
07Belknap County, NHNH65,147+3,763−47%
08Cheshire County, NHNH78,269+3,292−11%
09Sullivan County, NHNH43,961+3,284+76%
10Coos County, NHNH31,343-56−97%
SHOWING 1–10 OF 10
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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS