"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M6X8-XC3 : 12 April 2021), L John Corn, Van Buren, Jackson, Missouri, United States; citing enumeration district ED 32, sheet 173D, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,694.
"United States Census, 1840," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XHT5-8L2 : 4 October 2021), John Corn, Jackson, Missouri, United States; citing p. 87, NARA microfilm publication , (Washington D.C.: National Archives and Records Administration, n.d.), roll ; FHL microfilm .
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DNA Connections
It may be possible to confirm family relationships with John by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with John:
Corn-1478 and Corn-559 appear to represent the same person because: I haven't added all the profiles to my tree. from the names you have listed though are the same names I have on Ancestry.