Hillsview is a town in McPherson County, South Dakota, United States. The population was 2 at the 2020 census. Hillsview is the least-popul…Hillsview is a town in McPherson County, South Dakota, United States. The population was 2 at the 2020 census. Hillsview is the least-populated municipality in South Dakota. The town was named because of its lofty elevation.