"New Orleans, Louisiana Birth Records Index, 1790-1899," database online. Ancestry.com, Provo, Utah, USA. Vol 65 Pg 146. John Emmet O'Connor, 5 Nov 1874, New Orleans, Louisiana, USA, parents Patrick O'Connor and L M Nelson.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDXW-FNT : 13 August 2016), John E O'Connor in household of Patrick O'Connor, New Orleans, Orleans, Louisiana, United States; citing enumeration district ED 68, sheet 352D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0463; FHL microfilm 1,254,463.
"Louisiana, Parish Marriages, 1837-1957," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKJ4-SMX8 : 15 October 2015), John O'Connor and Rosetta Gallagher, 19 Mar 1898; citing Orleans, Louisiana, United States, various parish courthouses, Louisiana; FHL microfilm 907,707.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MS5R-SC8 : accessed 8 August 2017), John O Connor, 2nd Precinct New Orleans city Ward 14, Orleans, Louisiana, United States; citing enumeration district (ED) 131, sheet 13A, family 242, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,575.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MV7V-3TS : accessed 8 August 2017), John O'Conner, New Orleans Ward 12, Orleans, Louisiana, United States; citing ED 211, sheet 2A, line 19, family 30, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 623; FHL microfilm 1,820,623.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMRX-YTY : accessed 8 August 2017), John O'Connor, New Orleans (Districts 1-250), Orleans, Louisiana, United States; citing enumeration district (ED) ED 209, sheet 24A, line 5, family 297, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 810; FHL microfilm 2,340,545.
"Louisiana Biography and Obituary Index," database online. New Orleans Public Library, Louisiana Division/City Archives, New Orleans, Louisiana, USA (http://nopl.minisisinc.com/nopl/scripts/mwimain.dll/6939/1/0?SEARCH&ERRMSG=[WWW_NOPL]NoRecord.htm). O'Connor, John; Death date: 1935-01-20; Age: 60 years; Next of kin: Rosetta Gallagher (Wife); Times-Picayune 1935-01-21, Pg 2 Col 8 Sec 1 and 1935-01-22 Pg 3 Col 2 Sec 1.