[2] The Crook Farm was listed on the National Register of Historic Places in 1976.

[3] According to the United States Census Bureau, the township has a total area of 46.4 square miles (120 km2), all land.

As of the census[5] of 2010, there were 4,316 people, 1,829 households, and 1,305 families residing in the township.

23.8% of all households were made up of individuals, and 12.7% had someone living alone who was 65 years of age or older.

Compared to the rest of the country, Foster township's cost of living is 13.30% Lower than the U.S. average.