New Hampshire Population By County in 2020

Based on the US Census Vintage data estimates, in 2020, the population of New Hampshire was 1,378,587. Among all New Hampshire counties, Hillsborough[object Promise] had the highest population (422,883), followed by Rockingham[object Promise] (314,603), and Merrimack[object Promise] (154,022). Coos[object Promise] was the least populated county (31,227).

Hover over or click on the counties in the map below to see the populations. 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 see similar information for other states and by state for the United States.