Households have changed significantly in Thurston County over the last 50 years. In 1960, Thurston County averaged 3.1 people per household; since 2010, only households on average consist of just 2.5 people. This change can be attributed to a number of social trends including: an increasing tendency to postpone marriage, higher divorce rates, increasing numbers of one-parent families, an increase in the number of people choosing to live alone, and growing numbers of non-traditional households.
For Thurston County, Olympia and Tumwater had the smallest average household sizes. Yelm and the Nisqually and Chehalis Reservations had the largest households.