Corson is an unincorporated community in Brandon Township, Minnehaha County, South Dakota, United States with a population of 70. It lies immediately north of Interstate 90 and Brandon on South Dakota Highway 11. Once mainly a railroad and farming community, it is becoming an industrial area supporting the county. Sioux Falls is located 12 miles …Corson is an unincorporated community in Brandon Township, Minnehaha County, South Dakota, United States with a population of 70. It lies immediately north of Interstate 90 and Brandon on South Dakota Highway 11. Once mainly a railroad and farming community, it is becoming an industrial area supporting the county. Sioux Falls is located 12 miles west-southwest of the community. It is served by the BNSF Railway Company.