Klaasville, IndianaKlaasville is an unincorporated community in Hanover Township, Lake County, Indiana.HistoryKlaasville was founded in 1850. A post office was established at Klaasville in 1882, and remained in operation until it was discontinued in 1902. The community was named for the German American Klaas family of pioneer settlers. Klaasville was founded by settler H. Klaas.