New Hampshire 2020 Census Total Population By County

The total population of New Hampshire from the 2020 Census was 1,377,529, based on data from the US Census Bureau.

Hillsborough County was the most populated county (422,937), followed by Rockingham County (314,176), and then Merrimack County (153,808). On the other hand, the 3 counties that were least populated include: Coos County (31,268), Sullivan County (43,063), and Carroll County (50,107).

You can also see this information for other states and also for the US by state.

Hover over or click on the counties to see the number and percentage of New Hampshire population that lives in each county. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

You can also see the population by county for the different racial groups as well as the different ethnicities in New Hampshire.