"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XCS9-9KW : accessed 23 March 2017), Le Roy M Porter in household of Mccauley Porter, Portland (Districts 1-219), Multnomah, Oregon, United States; citing enumeration district (ED) ED 181, sheet 4A, line 21, family 85, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1951; FHL microfilm 2,341,685.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VRTP-93R : accessed 23 March 2017), Leroy M Porter, Tract 7, Portland, Portland City Election Precinct 152, Multnomah, Oregon, United States; citing enumeration district (ED) 37-207, sheet 5A, line 27, family 110, 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 3388.
It may be possible to confirm family relationships with Leroy by comparing test results with other carriers of his Y-chromosome or his mother's 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 Leroy: