RANKING · 2020 CENSUS · 10 SHOWN OF 10

Youngest by median age, New Hampshire counties · 2020

New Hampshire counties with the youngest median age (2023 ACS). 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 ZIP codes

RELATEDOldest by median age Most foreign-born residents Highest uninsured rate Most women Most men Highest disability rate

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Strafford County, NHNH135,04338.9+13%

02Hillsborough County, NHNH433,41540.9+14%

03Merrimack County, NHNH158,07843.4+15%

04Cheshire County, NHNH78,26943.6+16%

05Grafton County, NHNH93,22543.7+18%

06Rockingham County, NHNH324,07745.4+22%

07Sullivan County, NHNH43,96147.2+18%

08Belknap County, NHNH65,14749.3+23%

09Coos County, NHNH31,34350.4+21%

10Carroll County, NHNH52,78454.9+29%

SHOWING 1–10 OF 10

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