"United States Census, 1860," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MX4X-B5C : accessed 18 January 2015), William Campbell in household of Robert Campbell, Derinda Township, Jo Daviess, Illinois, United States; from "1860 U.S. Federal Census - Population," Fold3.com; citing p. 548, household ID 4014, NARA microfilm publication M653, National Archives and Records Administration, Washington, D.C.; FHL microfilm 803,189.
"United States Census, 1870," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MDV4-9D8 : accessed 18 January 2015), William A Campbell in household of Robert Campbell, Iowa, United States; citing p. 14, family 45, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,895.
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DNA Connections
It may be possible to confirm family relationships with William by comparing test results with other carriers of his ancestors' Y-chromosome or 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 William: