Joe, My name is Jerry Harwick and I am also researching the Harwicks of PA. You referenced John Harwick 1820, who I believe may be my great-grandfather b.27 Aug, 1833 who marriedCatherine Lantz(?)If we are on the same line, John's father was Adam b 16 Jul, 1796, and Johns mother was Susanna b 1775(6),d 1802(5). My link follows them to Darke County, OH. Actually Horatio,OH near Greenville,OH. Are we on the same track?