[4] According to the United States Census Bureau, the township has a total area of 35.1 square miles (90.8 km2), all land.

The racial makeup of the township was 95.60% White, 1.60% African American, 1.20% Asian, and 1.60% from two or more races.

About 1.8% of families and 5.5% of the population were below the poverty line, including 4.6% of those under the age of eighteen and none of those 65 or over.

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

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