As of the census in 2000, there were 15,770 people living in Middleton, although in 2006 that number was estimated to be as high as 16,595. The population density was 1,953.2 people per square mile (754.5/km2). There were 7,397 housing units at an average density of 916.2 per square mile (353.9/km2). The racial makeup of the city was 92.08% White, 1.97% Black or African American, 0.45% Native American, 2.66% Asian, 0.03% Pacific Islander, 1.27% from other races, and 1.54% from two or more races. 2.82% of the population were Hispanic or Latino of any race.