State: County:

The Census Bureau defines a housing unit as a house, an apartment, a mobile home or trailer, a group of rooms, or a single room occupied as separate living quarters (or if vacant, intended as separate living quarters). Housing units are classified as being occupied either by owners or renters or vacant.

In New Hampshire...

Source: 1990, 2000, 2010-2015: U.S. Bureau of the Census, Census of Population and Housing,