John Mertz & His wife Sarah Harmony? Mertz are very hard to find info for.
I have found the 1850 Census for Union Twp., Auglaize County Ohio. This area would be around St. Johns, OH and Uniopolis, OH
1850 Census John Mertz,age 49, Farmer, Born PA Sarah Mertz,age 47,, Born PA Archibald Mertz, age 20, Blacksmith, Born PA Franklin Mertz,age 15,, Born PA James Mertz,age 13,, Born PA Elizabeth Mertz, age 8,, Born PA William Mertz,age 6,, Born PA Emma Mertz,age 4,, Born PA
William Mertz name is really John William Mertz. Franklin Mertz name is really Benjamin Franklin Mertz.
John & His wife are buried in St. Johns, Auglaize COunty, Ohio with some of their children.
John or Sarah had to have had parents.
Johns Parents If information I have found is correct I can say that John Benjamin Mertz that was born Feb 1777 in Berks PA and that married Catherina Sterner who was born abt 1779 and were marriedabt 1796 cannot be his parents.