There were 114 housing units at an average density of 3.2 per square mile (1.2/km2).

23.3% of all households were made up of individuals, and 6.8% had someone living alone who was 65 years of age or older.

About 9.7% of families and 9.8% of the population were below the poverty line, including 11.4% of those under the age of eighteen and 18.2% of those 65 or over.

Middletown Township is located in Minnesota's 1st congressional district, represented by Mankato educator Tim Walz, a Democrat.

At the state level, Middletown Township is located in Senate District 22, represented by Republican Doug Magnus, and in House District 22B, represented by Republican Rod Hamilton.