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.

Flip the list · Youngest by median age, US counties →

New HampshireAll states All rankings

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

Download CSV (full list, 10 rows)

UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS