The 2014 Prosser, Washington, population is 5,680. There are 1,266 people per square mile (population density).
The median age is 35.1. The US median is 37.2. 51.84% of people in Prosser, Washington, are married. 10.13% are divorced.
The average household size is 2.59 people. 31.40% of people are married, with children. 18.60% have children, but are single.
81.16% of people are white, 0.00% are black, 1.41% are asian, 0.00% are native american, and 13.05% claim 'Other'.
33.40% of the people in Prosser, Washington, claim hispanic ethnicity (meaning 66.60% are non-hispanic).