Historic Places In Yankton County Yankton College Conservatory Yankton College campus, Yankton Volin Town Hall In Volin, Volin Yankton College Historic District 12 and Douglas Sts., Yankton Western Portland Cement Plant West of Yankton, Yankton Yankton Historic Commercial District Roughly bounded by 2nd, 4th, Pine and Broadway, Yankton FORMER LISTINGS Walnut Street Bridge Walnut Street over Marne Creek, Yankton Yankton Carnegie Library 4th and Capitol Sts., Yankton 30vYANKTON COUNTY GUIDE 2017 Yankton County Courthouse 3rd St. and Broadway, Yankton (Demolished in June 2013)