This appears to be the John. The Name seems to have many variations and there are lots of John. This is near Dundee
Census Place: Algonquin, Mc Henry, Illinois Source: FHL Film 1254228National Archives Film T9-0228Page 16C Relation Sex Marr Race Age Birthplace John EHLERT Self M M W 50 PRUSSIA Occ: Farmer Fa: PRUSSIA Mo: PRUSSIA Joanna EHLERT Wife F M W 49 PRUSSIA Occ: Keeps House Fa: PRUSSIA Mo: PRUSSIA Charlie EHLERT Son M S W 15 IL Occ: At School Fa: PRUSSIA Mo: PRUSSIA John EHLERT Son M S W 13 IL Occ: At School Fa: PRUSSIA Mo: PRUSSIA William EHLERT Son M S W 8 IL Occ: At School Fa: PRUSSIA Mo: PRUSSIA Minnie EHLERT Dau F S W 5 IL Fa: PRUSSIA Mo: PRUSSIA
Can't find John and Joanna in 1860, don't have an index for IL in 1870
There is a John Elhert in Dundee in 1900 b. 1862 Germany, Wife Caroline, and kids August, Emma, Annie, Louis, and Hellene
These appear to be different people. Can you give us futher information on John, his wife, and kids.