As of the census of 2000, there were 18,397 people, 8,053 households, and 4,831 families residing in the city. The population density was 1,823.1 people per square mile (704.0/km2). There were 8,682 housing units at an average density of 860.4 per square mile (332.2/km2). The racial makeup of the city was 91.35% White, 0.69% Black, 3.26% Native American, 1.29% Asian, 0.17% Pacific Islander, 0.38% from other races, and 2.85% from two or more races. Hispanic or Latino of any race were 2.34% of the population.