Census counts put Carroll County’s median age at 54.9 in 2020, up from 48.3 in 2010 and the highest in New Hampshire. Belknap County went from 44.7 to 49.3. Here is what the 2010 and 2020 censuses and the Census Bureau’s yearly estimates show about age, births, deaths and migration around Lake Winnipesaukee.
The Census Bureau’s American Community Survey put about 145,000 New Hampshire residents without health coverage in 2010 and about 62,000 in 2024. Adults under 45 had the highest estimated rates.
The federal census has counted New Hampshire 24 times, from 141,885 people in 1790 to 1,377,529 in 2020. The count fell once, in 1870. Since 1950, Hillsborough and Rockingham counties took three of every five new residents.
