The 2014 Kennewick, Washington, population is 73,640. There are 2,734 people per square mile (population density).
The median age is 32.5. The US median is 37.2. 52.71% of people in Kennewick, Washington, are married. 12.16% are divorced.
The average household size is 2.69 people. 34.76% of people are married, with children. 20.00% have children, but are single.
76.20% of people are white, 1.81% are black, 2.79% are asian, 1.15% are native american, and 15.27% claim 'Other'.
24.65% of the people in Kennewick, Washington, claim hispanic ethnicity (meaning 75.35% are non-hispanic).