"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6T4-JBD : 15 July 2017), Allen H Cox in household of Matthew Cox, Jumping Branch, Summers, West Virginia, United States; citing enumeration district ED 136, sheet 189C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1413; FHL microfilm 1,255,413.
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DNA Connections
It may be possible to confirm family relationships with Allen by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: