James O'Neill ( - )
Grace Amelia O'dell (16 Mar 1859 - 11 Apr 1932)
Amos Oakes (about 1769 - 1 Jan 1851)
Eliza Oakes ( - )
Jacob Oakes ( - )
Edith May Oakley (1889 - 24 Jun 1954)
George Oakley ( - )
Martha Oaks ( - 28 May 1824)
Benjamin Ober ( - 7 Mar 1886)
Lois Ober (9 Mar 1816 - 20 Mar 1889)
Maria L. Ober (calculated 18 Feb 1839 - 1 Aug 1870)
Dewey E. Obrien (1859 - 1915)
Bob Odeen ( - )
Justin Regina Odell ( - )
Orson Odell ( - )
Maria B. Ogden ( - )
Elizabeth Olds (7 Sep 1772 - )
Martha Alma Olmstead ( - )
Frank Olney ( - )
Maude Elsie Olney (25 Jul 1885 - 4 Feb 1968)
Walter Wilhelm Olsen (1 Mar 1905 - Feb 1965)
Phillip Olson ( - )
Valeria Dorothy Olson ( - )
Mary Electa Orcutt (18 Aug 1833 - 21 Jun 1920)
Ruth Orcutt ( - )
Jonathan Ordway ( - )
Rachel Ordway (about 1794 - 1 Dec 1840)
Lewis St. Ores (1818 - 13 Nov 1893)
Christiana Ormsbee (calculated 12 Jan 1835 - 30 Oct 1923)
Hosea K. Ormsbee (8 Apr 1801 - 7 Oct 1879)
Sybil Ormsbee (about 1844 - )
Thomas Ormsbee ( - )
Avery W. Osborn ( - )
Frank Laggon Osborn (13 Aug 1852 - )
Mabel Osborn ( - )
Dinah Osgood (say 1733/34 - )
Hepsibah Osgood (26 Jul 1796 - 1 Apr 1865)
Hooker Osgood (say 1735 - )
Hooker Osgood (26 Mar 1693 - 5 Jan 1765)
John Osgood (12 Jan 1723/24 - 26 Aug 1724)
John Osgood (5 Jun 1725 - )