According to the United States Census Bureau, the township has a total area of, of which is land and is water. Center Lake is on the township's southern boundary and is adjacent to Michigan Center. Gilletts Lake, Brill Lake, and Goose Lake are in the central region of the township. The Portage River runs close to the northern border of the township. The entire township is part of the Grand River watershed.
Demographics
As of the census of 2000, there were 13,459 people, 5,240 households, and 3,825 families residing in the township. The population density was 274.1 per square mile. There were 5,568 housing units at an average density of 113.4 per square mile. The racial makeup of the township was 97.04% White, 0.82% African American, 0.31% Native American, 0.33% Asian, 0.02% Pacific Islander, 0.31% from other races, and 1.17% from two or more races. Hispanic or Latino of any race were 1.62% of the population. There were 5,240 households, out of which 33.4% had children under the age of 18 living with them, 56.7% were married couplesliving together, 11.5% had a female householder with no husband present, and 27.0% were non-families. 21.8% of all households were made up of individuals, and 8.7% had someone living alone who was 65 years of age or older. The average household size was 2.56 and the average family size was 2.97. In the township the population was spread out, with 25.9% under the age of 18, 7.0% from 18 to 24, 30.0% from 25 to 44, 24.6% from 45 to 64, and 12.4% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 98.2 males. For every 100 females age 18 and over, there were 96.7 males. The median income for a household in the township was $43,551, and the median income for a family was $47,032. Males had a median income of $38,306 versus $27,870 for females. The per capita income for the township was $19,329. About 6.5% of families and 7.9% of the population were below the poverty line, including 10.6% of those under age 18 and 6.1% of those age 65 or over.
