Lake Madison is located in South Dakota. Lake Madison, South Dakota has a population of 873. Lake Madison is less family-centric than the surrounding county with 7.53% of the households containing married families with children. The county average for households married with children is 27.5%.
The median household income in Lake Madison, South Dakota is $85,703. The median household income for the surrounding county is $58,467 compared to the national median of $57,652. The median age of people living in Lake Madison is 61.3 years.
The average high temperature in July is 83.5 degrees, with an average low temperature in January of 5.8 degrees. The average rainfall is approximately 26.8 inches per year, with 38.1 inches of snow per year.