Tualatin is a city located primarily in Washington County in the U.S. state of Oregon. A small portion of the city is also located in neighboring Clackamas County. It is a southwestern suburb in the Portland Metropolitan Area that is located south of Tigard. The population was 26,054 at the 2010 census. As of the census of 2000, there were 22,791 people, 8,651 households, and 5,804 families residing in the city. The population density was 2,928.5 people per square mile (1,131.1/km²). There were 9,218 housing units at an average density of 1,184.4 per square mile (457.5/km²). The racial makeup of the city was 86.89% White, 0.79% African American, 0.69% Native American, 3.62% Asian, 0.37% Pacific Islander, 4.84% from other races, and 2.81% from two or more races. Hispanic or Latino of any race were 11.85% of the population.