"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3N7-GY8 : accessed 17 July 2020), William J Casey in household of Robert P Casey, Militia Districts 845, 1319, Roswell, Post Oak Roswell town, Cobb, Georgia, United States; citing enumeration district (ED) 29, sheet 16B, family 293, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,188.
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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.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: