According to the United States Census Bureau, the township has a total area of 34.9 square miles (90 km2), of which 34.0 square miles (88 km2) is land and 0.9 square miles (2.3 km2) (2.58%) is water.
The city of Cologne is located entirely within the township geographically but is a separate entity.
The township contains five cemeteries: Cologne United Methodist, Saint Bernard, Saint John's United Church of Christ, Snapsburg and Zion Lutheran Church.
As of the census[1] of 2000, there were 939 people, 307 households, and 249 families residing in the township. The population density was 27.6 inhabitants per square mile (10.7/km2). There were 311 housing units at an average density of 9.2/sq mi (3.5/km2). The racial makeup of the township was 99.47% White, 0.11% Native American, 0.32% Asian, 0.11% from other races. Hispanic or Latino of any race were 0.53% of the population.
There were 307 households, out of which 38.8% had children under the age of 18 living with them, 72.6% were married couples living together, 4.2% had a female householder with no husband present, and 18.6% were non-families. 15.0% of all households were made up of individuals, and 6.5% had someone living alone who was 65 years of age or older. The average household size was 3.06 and the average family size was 3.43.
In the township the population was spread out, with 28.1% under the age of 18, 9.6% from 18 to 24, 26.6% from 25 to 44, 23.6% from 45 to 64, and 12.0% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 115.4 males. For every 100 females age 18 and over, there were 116.3 males.
The median income for a household in the township was $62,574, and the median income for a family was $63,839. Males had a median income of $38,173 versus $28,917 for females. The per capita income for the township was $22,652. About 1.2% of families and 2.6% of the population were below the poverty line, including 2.4% of those under age 18 and 8.8% of those age 65 or over.
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