As of the census of 2000, there were 15,374 people, 6,497 households, and 4,028 families residing in the city. The population density was 1,451.9 people per square mile (560.5/km). There were 7,094 housing units at an average density of 669.9 per square mile (258.6/km). The racial makeup of the city was 90.75% White, 0.37% African American, 2.27% Native American, 1.44% Asian, 0.31% Pacific Islander, 1.35% from other races, and 3.51% from two or more races. 4.49% of the population were Hispanic or Latino of any race.