Keystone is located in South Dakota. Keystone, South Dakota 57751has a population of 396. Keystone 57751 is less family-centric than the surrounding county with 17% households with children. The county percentage for households with children is 26%.
The median household income in Keystone, South Dakota 57751 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 57751 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.