The 2016 Kennewick, Washington, population is 78,896. There are 2,936 people per square mile (population density).
The median age is 32.9. The US median is 37.4. 53.22% of people in Kennewick, Washington, are married. 12.05% are divorced.
The average household size is 2.74 people. 35.61% of people are married, with children. 18.27% have children, but are single.
67.79% of people are white, 2.31% are black, 2.49% are asian, 0.56% are native american, and 0.13% claim 'Other'.
24.57% of the people in Kennewick, Washington, claim hispanic ethnicity (meaning 75.43% are non-hispanic).