Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Roberts County is a county located in the U.S. state of South Dakota. As of 2000, the population was 10,016. Its county seat is Sisseton. The county was named either for S. G. Roberts of Fargo, North Dakota, or for Solomon Robar, an early local French fur trader. According to the U.S. Census Bureau, the county has a total area of 1,135 square miles (2,941 km²), of which,... Mehr