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RANKING · 2025 ESTIMATES · 10 SHOWN OF 10

Most population gained, New Hampshire counties

New Hampshire counties that added the most residents from the 2020 census to 2025, by raw count of people rather than percentage. This list covers the 10 counties in New Hampshire that qualify, ranked against each other statewide. The median across all 10 is +2,677.

Flip the list · Most population lost, US counties →
SAME RANKING BYCitiesStatesMetros
Most population gained by state
All USAlaskaAlabamaArkansasArizonaCaliforniaColoradoFloridaGeorgiaIowaIdahoIllinoisIndianaKansasKentuckyLouisianaMassachusettsMarylandMaineMichiganMinnesotaMissouriMississippiMontanaNorth CarolinaNorth DakotaNebraskaNew HampshireNew JerseyNew MexicoNevadaNew YorkOhioOklahomaOregonPennsylvaniaSouth CarolinaSouth DakotaTennesseeTexasUtahVirginiaVermontWashingtonWisconsinWest VirginiaWyoming
RANKPLACESTATEPOPPOPULATION CHANGEVS 2000
01Hillsborough County, NHNH433,415+10,478−77%
02Rockingham County, NHNH324,077+9,901−69%
03▲1Merrimack County, NHNH158,078+4,270−74%
04▼1Strafford County, NHNH135,043+4,154−48%
05▲1Carroll County, NHNH52,784+2,677−68%
06▲1Grafton County, NHNH93,225+2,107−69%
07▲1Cheshire County, NHNH78,269+1,811−51%
08▼3Belknap County, NHNH65,147+1,442−80%
09Sullivan County, NHNH43,961+898−52%
10Coos County, NHNH31,343+75−104%
SHOWING 1–10 OF 10

UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES