There was a John and Sarah Floyd family listed in the 1880 census of Humboldt Twp, Coles Co, IL. Could it be this John with a first wife?
Residences & events:
1880 Humboldt Twp, Coles Co, IL. The census taker recorded John at age 27, a farmer, wife Sarah was 26. Living with them were children, Nettie, 6, Nellie, 4, Carrie, 3 born in KS, William M, 5 mo and Frank Price, 26, as farm hand.