The racial makeup of the township was 99.07% White, 0.47% Native American and 0.47% Asian.

16.5% of all households were made up of individuals, and 10.1% had someone living alone who was 65 years of age or older.

About 6.3% of families and 6.3% of the population were below the poverty line, including 8.3% of those under the age of eighteen and 7.5% of those 65 or over.

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

At the state level, Rose Dell Township is located in Senate District 22, represented by Republican farmer Doug Magnus, and in House District 22A, represented by Republican businessman-educatorJoe Schomacker.