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RANKING · 2025 ESTIMATES · 10 SHOWN OF 10

Most population lost, New Hampshire counties

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

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