"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFSR-TY1 : 12 April 2016), Mark Sullivan in household of Charles Sullivan, Mississippi, United States; citing p. 1, family 2, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,248.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4P3-P3F : 12 August 2017), Mark Sullivan, Beat 3 Taylorsville, Smith, Mississippi, United States; citing enumeration district ED 105, sheet 318A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0664; FHL microfilm 1,254,664.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9FS-VZN : accessed 13 March 2018), Mark A Sullivan, Beat 3 (west of Oschay Creek), Smith, Mississippi, United States; citing enumeration district (ED) 104, sheet 10B, family 160, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,828.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MPDG-WNL : accessed 13 March 2018), Mark A Sullivan, Beat 3, Smith, Mississippi, United States; citing enumeration district (ED) ED 112, sheet 16B, family 234, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 759; FHL microfilm 1,374,772.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNTN-4F7 : accessed 13 March 2018), Mark A Sullivan, Beat 3, Smith, Mississippi, United States; citing ED 122, sheet 20A, line 33, family 273, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 894; FHL microfilm 1,820,894.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X9M8-CF6 : accessed 13 March 2018), Mark A Sullivan, Beat 3, Smith, Mississippi, United States; citing enumeration district (ED) ED 10, sheet 15B, line 63, family 304, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1165; FHL microfilm 2,340,900.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VB3Q-JPQ : accessed 13 March 2018), Mark A Sullivan, Beat 3, Smith, Mississippi, United States; citing enumeration district (ED) 65-12A, sheet 18B, line 71, family 333, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 2065.
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DNA Connections
It may be possible to confirm family relationships with Mack by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: