Kosciusko County was ceded by chiefs of the Miami nation, Papakeechie and Wawasee, on Oct. 27, 1832. Kosciusko County was officially established on Feb. 7, 1835. The county was named after the Polish general Thaddeus Kościuszko who served in the Revolutionary War, and worked alongside George Washington with the idea of creating the United States Military …read more.