"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDKG-GG5 : 19 August 2017), John Fiscus in household of George Fiscus, Douglas, Audubon, Iowa, United States; citing enumeration district ED 26, sheet 36D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0326; FHL microfilm 1,254,326.
» Lovell, Rosemary (Faulk). Owen County Cousins (J. G. Hauser, Inc., 1977) For repository information see: WorldCat; p. 550, entry for Levi Fiscus
It may be possible to confirm family relationships with John 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 DNA with John: