George was born about 1885. May have been born in New York.
Sources
"New York, New York City Births, 1846-1909," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2WM6-HVW : 11 February 2018), George O'Keefe, 17 Feb 1886; citing Manhattan, New York, New York, United States, reference cn 450428 New York Municipal Archives, New York; FHL microfilm 1,322,208.
"New Jersey State Census, 1905," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KM4D-6K4 : 3 April 2016), George Okeefe, , Hudson, New Jersey, United States; citing p. 19, line 80, Department of State, Trenton; FHL microfilm 1,688,610.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKYP-W5S : accessed 28 February 2022), George O'Keefe in household of Cornelius O'Keefe Jr., Jersey City Ward 12, Hudson, New Jersey, United States; citing enumeration district (ED) ED 216, sheet 4A, family 83, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 893; FHL microfilm 1,374,906.
"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KZJV-7ZL : 31 December 2021), George Cornelious O Keefe, 1917-1918.
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:X46G-N8K : accessed 28 February 2022), George O'Keefe, Jersey City, Hudson, New Jersey, United States; citing enumeration district (ED) ED 81, sheet 4B, line 67, family 98, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1352; FHL microfilm 2,341,087.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K4B9-MKB : 11 January 2021), George O'Keefe, Jersey City, Hudson, New Jersey, United States; citing enumeration district (ED) 24-144, sheet 1B, line 73, family 20, 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 2405.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VMPJ-34Q : 8 January 2021), George Okeefe, Mar 1971; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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