Name is frequently transcribed as Jacob O. Harris.
Sources
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MCY7-BZN : 12 April 2016), Jacob O Harris, Poughkeepsie, Dutchess, New York, United States; citing family 2081, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"New York State Census, 1865," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/QVNN-4YRP : accessed 14 June 2018), Jacob O Harris in household of Henry B Duncan, , La Grange, Dutchess, New York, United States; citing source p. 41, line 43, household ID 288, county clerk, board of supervisors and surrogate court offices from various counties. Utica and East Hampton Public Libraries, New York; FHL microfilm 565,244.
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M8FG-K97 : 12 April 2016), J O Harris, New York, United States; citing p. 34, family 265, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,425.
"New York Marriages, 1686-1980," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VK1K-2MZ : 10 February 2018), Jacob Harris and Jane Ann Phillips, 05 May 1825; citing reference ; FHL microfilm 974.7 B2N V. 73-75.
"Find A Grave Index," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/QVLT-YH1Z : 13 December 2015), Jacob O. Harris, 1872; Burial, Freedom Plains, Dutchess, New York, United States of America, Presbyterian Ground; citing record ID 105522308, Find a Grave, http://www.findagrave.com.
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