McDonaldsville Township was organized in 1874, and named for Finnen McDonald, a Scottish settler.

[3] According to the United States Census Bureau, the township has a total area of 34.8 square miles (90.2 km2), all land.

There were 81 housing units at an average density of 2.3 per square mile (0.89/km2).

10.3% of all households were made up of individuals, and 2.9% had someone living alone who was 65 years of age or older.

About 6.3% of families and 6.8% of the population were below the poverty line, including none of those under the age of eighteen and 6.3% of those 65 or over.