The 2016 Prosser, Washington, population is 5,869. There are 1,291 people per square mile (population density).
The median age is 33.5. The US median is 37.4. 53.76% of people in Prosser, Washington, are married. 9.77% are divorced.
The average household size is 2.6 people. 27.96% of people are married, with children. 18.12% have children, but are single.
68.12% of people are white, 0.00% are black, 0.19% are asian, 0.00% are native american, and 0.00% claim 'Other'.
29.62% of the people in Prosser, Washington, claim hispanic ethnicity (meaning 70.38% are non-hispanic).