There are 66 counties in South Dakota. Each county is governed by a board of commissioners.
There are 1,339 county subdivisions in South Dakota known as minor civil divisions (MCDs). There are 914 townships with functioning, but not necessarily active, governments. Townships are each governed by a board of supervisors. The 311 incorporated places in South Dakota are independent of MCDs and serve as 320 county subdivisions. In addition, there are 105 unorganized territories in South Dakota. Bennett, Bon Homme, Buffalo, Campbell, Custer, Dewey, Haakon, Harding, Potter, Shannon, Stanley, Sully, Todd, Walworth, and Ziebach Counties have no townships and are covered entirely by unorganized territories and incorporated places.