"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KQ78-9QM : 7 January 2021), Mary McKinley in household of Lucien McKinley, Oil City, Venango, Pennsylvania, United States; citing enumeration district (ED) 61-31, sheet 13B, line 53, family 272, 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 3616.
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