According to the United States Census Bureau, the township has a total area of 46.7 square miles (121.0 km2), of which 46.4 square miles (120.1 km2) is land and 0.31 square miles (0.8 km2), or 0.70%, is water.
As of the census[5] of 2010, there were 12,289 people, 4,875 households, and 3,111 families residing in the township. The population density was 262.4 inhabitants per square mile (101.3/km2). There were 5,111 housing units at an average density of 109.1 per square mile (42.1/km2). The racial makeup of the township was 96.6% White, 1.2% African American, 0.1% Native American, 0.9% Asian, 0.02% Pacific Islander, 0.2% from other races, and 0.8% from two or more races. Hispanic or Latino of any race were 0.9% of the population.
There were 4,875 households, out of which 36.4% had children under the age of 18 living with them, 63.8% were married couples living together, 9.1% had a female householder with no husband present, and 36.2% were non-families. 25.4% of all households were made up of individuals, and 16.4% had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 2.8.
In the township the population was spread out, with 16.3% under the age of 18, 18.5% from 18 to 24, 19.0% from 25 to 44, 29.7% from 45 to 64, and 16.4% who were 65 years of age or older. The median age was 41.5 years. For every 100 females, there were 96.8 males. For every 100 females age 18 and over, there were 95.6 males.
The median income for a household in the township was $36,993, and the median income for a family was $48,943. Males had a median income of $45,988 versus $32,051 for females. The per capita income for the township was $26,033. About 6.6% of families and 14.1% of the population were below the poverty line, including 14.9% of those under age 18 and 7.5% of those age 65 or over.
