Buffalo County, South Dakota

Buffalo County is a county located in the U.S. state of South Dakota. As of the 2020 census, 1,948 people lived there. Its county seat is Gann Valley which, at 10 people, is the least populous county seat in the United States. It was created in 1864. as part of the Dakota Territory.

 References 

Category:South Dakota counties
Category:1871 establishments in Dakota Territory