RANKING · 2000 CENSUS · 10 SHOWN OF 10

Youngest by median age, New Hampshire counties · 2000

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, NHNH135,04334.4+0%

02Hillsborough County, NHNH433,41535.9+0%

03Grafton County, NHNH93,22537.0+0%

04Rockingham County, NHNH324,07737.2+0%

05Cheshire County, NHNH78,26937.6+0%

06Merrimack County, NHNH158,07837.7+0%

07Sullivan County, NHNH43,96140.0+0%

08Belknap County, NHNH65,14740.1+0%

09Coos County, NHNH31,34341.5+0%

10Carroll County, NHNH52,78442.5+0%

SHOWING 1–10 OF 10

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