I checked your message history hoping to find more details, but you never say when John was in Vernon & Cedar Co, MO, or Lucas Co, IA, or Coryell Co, TX.
Is the following your John and Mary still in Belmlnt Co, OH in 1880?
Category: Name;Relationship to head of household; Marital Status; Gender; Race; Age; Birthplace; Occupation; Father's Birthplace; Mother's Birthplace.
John MANSFIELDSelfMMaleW59OHFarmerPAPA Mary L. MANSFIELDWifeMFemaleW59VAKeeping HouseVAVA Mary E. MANSFIELDDauSFemaleW27OHAt HomeOHVA Christopher C. MANSFIELDSonSMaleW23OHFarmerOHVA Sarah E. MANSFIELDDauSFemaleW20OHAt HomeOHVA Emma B. MANSFIELDDauSFemaleW15OHAt HomeOHVA
If you think this is your John, I trackedhim back two more censuses and think I've found his mother, too.But, no sense typing it all up if he isn't the right feller.