As of the census of 2010, there were 17,234 people, 6,155 households, and 4,372 families living in the township. The population density was 503.9 people per square mile. There were 6,461 housing units at an average density of 188.9/sq mi. The racial makeup of the township was 96.7% White, 1.4% African American, 0.1% Native American, 0.8% Asian, 0.2% from other races, and 0.8% from two or more races. Hispanic or Latino of any race were 1% of the population. There were 6,155 households, 28.3% had children under the age of 18 living with them, 59.1% were married couplesliving together, 7.7% had a female householder with no husband present, and 29% were non-families. 24.2% of households were made up of individuals, and 12% were one person aged 65 or older. The average household size was 2.49 and the average family size was 2.96. The age distribution was 26.7% under the age of 20, 8.5% from 20 to 24, 19% from 25 to 44, 29.2% from 45 to 64, and 16.6% 65 or older. The median age was 41.5 years. The median household income was $61,800 and the median family income was $72,445. Males had a median income of $53,302 versus $34,747 for females. The per capita income for the township was $24,525. About 3.9% of families and 9.1% of the population were below the poverty line, including 8.5% of those under age 18 and 6.5% of those age 65 or over.
2000 census
At the 2000 census there were 15,178 people, 5,398 households, and 4,021 families living in the township. The population density was 443.2 people per square mile. There were 5,645 housing units at an average density of 164.8/sq mi. The racial makeup of the township was 97.52% White, 1.21% African American, 0.08% Native American, 0.51% Asian, 0.01% Pacific Islander, 0.17% from other races, and 0.49% from two or more races. Hispanic or Latino of any race were 0.57%. There were 5,398 households, 31.6% had children under the age of 18 living with them, 63.6% were married couples living together, 7.4% had a female householder with no husband present, and 25.5% were non-families. 21.9% of households were made up of individuals, and 11.5% were one person aged 65 or older. The average household size was 2.64 and the average family size was 3.08. The age distribution was 23.6% under the age of 18, 10.0% from 18 to 24, 24.4% from 25 to 44, 25.6% from 45 to 64, and 16.4% 65 or older. The median age was 40 years. For every 100 females there were 97.8 males. For every 100 females age 18 and over, there were 93.4 males. The median household income was $47,294 and the median family income was $54,291. Males had a median income of $39,912 versus $26,698 for females. The per capita income for the township was $20,025. About 3.0% of families and 5.5% of the population were below the poverty line, including 4.7% of those under age 18 and 8.2% of those age 65 or over.
