Pioneer Families of Kosciusko County (P.F.K.C.) Applicants must prove that their ancestor lived in Kosciusko County before 1850. Pioneer Families II (P.F.C.K II) of Kosciusko County must prove that their ancestor lived in Kosciusko county between 1850 - 1870. Applications for both can be found on this page. Part of the Kosciusko County Historical Society.