As of the census of 2000, there were 19,169 people, 6,786 households, and 5,374 families residing in the township. The population density was 570.2 per square mile (220.1/km2). There were 7,179 housing units at an average density of 213.5 per square mile (82.4/km2). The racial makeup of the township was 97.42% White, 0.30% African American, 0.46% Native American, 0.37% Asian, 0.02% Pacific Islander, 0.25% from other races, and 1.17% from two or more races. Hispanic or Latino of any race were 1.27% of the population.