Farmington Township was organized in 1858, and named for their fertile farmland.

[3] According to the United States Census Bureau, the township has a total area of 35.8 square miles (93 km2), all land.

As of the census[1] of 2000, there were 516 people, 189 households, and 143 families residing in the township.

There were 197 housing units at an average density of 5.5 per square mile (2.1/km2).

21.2% of all households were made up of individuals, and 11.1% had someone living alone who was 65 years of age or older.