RANKING · 2020 CENSUS · 10 SHOWN OF 10

Oldest by median age, New Hampshire counties · 2020

New Hampshire counties ranked by median age of residents (2020 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

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Largest senior population Most unmarried people

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Carroll County, NHNH52,78454.9+29%

02Coos County, NHNH31,34350.4+21%

03Belknap County, NHNH65,14749.3+23%

04Sullivan County, NHNH43,96147.2+18%

05Rockingham County, NHNH324,07745.4+22%

06Grafton County, NHNH93,22543.7+18%

07Cheshire County, NHNH78,26943.6+16%

08Merrimack County, NHNH158,07843.4+15%

09Hillsborough County, NHNH433,41540.9+14%

10Strafford County, NHNH135,04338.9+13%

SHOWING 1–10 OF 10

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS