As of the census of 2000, there were 4,668 people, 1,578 households, and 1,292 families residing in the township. The population density was 139.9 people per square mile (54.0/km²). There were 1,662 housing units at an average density of 49.8/sq mi (19.2/km²). The racial makeup of the township was 97.45% White, 0.30% African American, 0.39% Native American, 0.30% Asian, 0.11% Pacific Islander, 0.13% from other races, and 1.33% from two or more races. Hispanic or Latino of any race were 1.20% of the population.

There were 1,578 households out of which 44.5% had children under the age of 18 living with them, 70.8% were married couples living together, 6.5% had a female householder with no husband present, and 18.1% were non-families. 13.3% of all households were made up of individuals and 2.2% had someone living alone who was 65 years of age or older. The average household size was 2.95 and the average family size was 3.22.

In the township the population was spread out with 30.0% under the age of 18, 6.8% from 18 to 24, 35.3% from 25 to 44, 23.4% from 45 to 64, and 4.5% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 109.7 males. For every 100 females age 18 and over, there were 108.1 males.

The median income for a household in the township was $58,596, and the median income for a family was $60,000. Males had a median income of $43,373 versus $30,568 for females. The per capita income for the township was $23,690. About 2.5% of families and 3.5% of the population were below the poverty line, including 4.5% of those under age 18 and none of those age 65 or over. The original homesteading families were the Broadbents, Carlisles, Clarks, and Browns.