1. The state is in both the Central and Mountain Time Zones.
2. The North America pole of inaccessibility is between two small towns in southwestern South Dakota (Kyle and Allen). This spot is 1,024 miles from the nearest coastline.
3. Close to 10% of the state's population is Native American; west of the Missouri River, that increases to approximately 20% (mostly Lakota, Dakota, and Nakota Sioux).
6. The state's center of population falls in Buffalo County's seat, Gann Valley -- the least populous county seat in the U.S., with 14 residents in 2010.