[3] Prairieville Township was organized in 1870, and named from the prairie contained within its borders.

[4] According to the United States Census Bureau, the township has a total area of 34.4 square miles (89.0 km2), of which 34.3 square miles (89.0 km2) is land and 0.03% is water.

As of the census[1] of 2000, there were 346 people, 119 households, and 94 families residing in the township.

There were 119 households, out of which 40.3% had children under the age of 18 living with them, 75.6% were married couples living together, 1.7% had a female householder with no husband present, and 20.2% were non-families.

17.6% of all households were made up of individuals, and 6.7% had someone living alone who was 65 years of age or older.