"New York State Census, 1905," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKMN-ZFB : 8 May 2020), Joseph J Obrien in household of Bartholomew Obrien, Marlborough, A.D. 02, Milton Village, E.D. 02, Ulster, New York; citing p. 7, line 44, various county clerk offices, New York; FHL microfilm 842,652.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M57K-Q6M : accessed 9 September 2020), Joseph O Brien in household of Bartholow O Brien, Marlborough, Ulster, New York, United States; citing enumeration district (ED) ED 151, sheet 13B, family 228, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1084; FHL microfilm 1,375,097.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MVSY-W2B : accessed 9 September 2020), Joseph Obrien in household of Bartholemew Obrien, Marlboro, Ulster, New York, United States; citing ED 182, sheet 1A, line 50, family 2, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1271; FHL microfilm 1,821,271.
"New York State Census, 1925," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KSH5-2D2 : 8 November 2014), Joseph O'Brien, Marlborough, A.D. 01, E.D. 03, Ulster, New York, United States; records extracted by Ancestry and images digitized by FamilySearch; citing p. 3, line 32, New York State Archives, Albany.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X4LT-6SY : accessed 9 September 2020), Joe O Brien, Marlboro, Ulster, New York, United States; citing enumeration district (ED) ED 39, sheet 5A, line 21, family 105, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1655; FHL microfilm 2,341,389.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K31P-VNW : 27 July 2019), Joseph M O'Brien, Marlborough Town, Ulster, New York, United States; citing enumeration district (ED) 56-53, sheet 22B, line 72, family 344, 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 2795.
Find a Grave, database and images (https://www.findagrave.com : accessed 9 October 2020), memorial page for Joseph J O'Brien Sr. (12 Feb 1904–29 Aug 1984), Find a Grave Memorial no. 151852424, citing Saint Mary's Cemetery, Marlboro, Ulster County, New York, USA ; Maintained by NoraK (contributor 46838659) .
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