As of the census[1] of 2000, there were 202 people, 83 households, and 60 families residing in the township.

27.7% of all households were made up of individuals, and 7.2% had someone living alone who was 65 years of age or older.

About 10.4% of families and 11.8% of the population were below the poverty line, including 20.3% of those under the age of eighteen and 5.9% of those 65 or over.

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

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