Keystone is located in South Dakota. Keystone, South Dakota has a population of 396. Keystone is less family-centric than the surrounding county with 18% households with children. The county percentage for households with children is 26%.
The median household income in Keystone, South Dakota is $88,214. The median household income for the surrounding county is $58,978 compared to the national median of $66,222. The median age of people living in Keystone is 51.1 years.
The average high temperature in July is 78.8 degrees, with an average low temperature in January of 16.1 degrees. The annual precipitation is 18.88.