Minnehaha County is a
county located in the
state of
South Dakota. As of the
2010 census, the population was 169,468, making it the most populous county in South Dakota. Its
county seat is
Sioux Falls. The county was created in 1862 and organized in 1868. It received its name from the
Sioux word
Mnihaha, meaning "rapid water," or "waterfall" (often also incorrectly translated as "laughing water").