David, I was just looking over the queries, found yours, and wondered if the following will help . . .
1860 Blackcreek Twp., Mercer Co., Ohio Census Entry 633 HeffnerConrad38 m born in GermanyFarmer Margaret30 f Germany Margaret13 f Oh Charity11 f Oh Matilda10 f Oh Sophia8 f Oh John6 m Oh George3 m Oh May11/12 f Oh ByerGeorge18 m OhFarmer
also on this page down 3 families is: Entry 636 Heffner George35 m GermanyFarmer Sophia34 f Germany Jane M.8 f Oh Maria4 f Oh Caroline1 f Oh MayPhilip23 m BadenCarpenter SiedeCharles21 m PaLaborer
I also show a Jacob Deitsch with wife Catherine in Jefferson Twp. They do have a daughter Mary, but no Maria. If this is your family let me know. Jacob's marriage of 1852 was listed to a Charity MILLER. Dianne in WA