[3] According to the United States Census Bureau, the township has a total area of 43.0 square miles (111 km2), all land.

19.0% of all households were made up of individuals, and 9.5% had someone living alone who was 65 years of age or older.

About 8.3% of families and 13.6% of the population were below the poverty line, including 22.4% of those under the age of eighteen and 9.5% of those sixty five or over.

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

At the state level, Altona Township is located in Senate District 22, represented by Republican Doug Magnus, and in House District 22A, represented by Republican Joe Schomacker.