"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6WZ-8Y6 : accessed 28 May 2016), Oliver Johnson in household of Oliver Johnson, Illinois, United States; citing p. 17, family 122, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,738.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXVQ-75B : accessed 28 May 2016), Oliver C Johnson in household of Oliver C Johnson, Na-Au-Say, Kendall, Illinois, United States; citing enumeration district ED 103, sheet 389D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0219; FHL microfilm 1,254,219.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSWQ-2MN : accessed 2 January 2016), Oliver C Johnson, Morris Township Morris city Ward 1, Grundy, Illinois, United States; citing sheet 11A, family 241, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,304.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MPK8-711 : accessed 2 January 2016), Oliver C Johnson, Omro, Winnebago, Wisconsin, United States; citing enumeration district (ED) ED 132, sheet 12A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,375,757.
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DNA Connections
It may be possible to confirm family relationships with Oliver 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 Oliver: