| Oakland, Doreen (Paquin) (PDF) | 1957 to 2011 |
| Oakley, Elsie L. | 1926 to 2014 |
| Oberg, Joan M. (Arsenault) (PDF) | 1939 to 2020 |
| O'Banyoun, Mary | died 1916 |
| O'Brien, Constance Mary "Connie" (Carpenter) (PDF) | 1932 to 2017 |
| O'Brien, John Peter | 1927 to 1980 |
| O'Brien, Joseph Michael | 1959 to 1979 |
| O'Connell, Charles P. (PDF) | 1935 to 1985 |
| O'Connell, James M. | 1968 to 1996 |
| O'Donnell, Mary E | died 1954 |
| O'Keefe, Agnes Catherine (Mahoney) (PDF) | 1903 to 1987 |
| O'Keefe, Timothy L. | died 1965 |
| O'Leary, Daniel | died 1986 |
| O'Leary, Katherine | died 1983 |
| O'Neil, Pauline G. (Alward) | 1911 to 1980 |
| O'Reilly, John W (PDF) | 1953 to 2019 |
| O'Reilly, Joseph P. (PDF) | 1936 to 2011 |
| O'Reilly, Agatha (Bird) | 1911 to 1991 |
| O'Reilly, Richard J. (PDF) | 1953 to 2005 |
| O'Reilly, William John | 1906 to 1958 |
| Odam, Nancy M | to 2021 |
| Oddy, Beatrice D. | 1906 to 1993 |
| Oddy, Christina Janet | 1914 to 1947 |
| Oddy, Dorothy (Douglas) (Crane) | 1929 to 1980 |
| Oddy, Dorothy Lucy (Flagg) | 1903 to 1973 |
| Oddy, Gwendolyn Cora (Pitkin) | 1908 to 1976 |
| Oddy, John | 1835 to 1906 |
| Oddy, John George | 1902 to 1965 |
| Oddy, Mary Jane (Brown) (PDF) | 1880 to 1957 |
| Oddy, Parkinson | 1869 to 1953 |
| Oddy, Parkinson, Louis, M.D. | 1903 to 1971 |
| Oddy, Paul Charles | 1911 to 1927 |
| Oddy, Samuel Alfred | 1907 to 1920 |
| Oddy, Sarah (Dibb) | 1835 to 1911 |
| Oddy, William B. Jr. | 1936 to 1987 |
| Oddy, William Bradford D.M.D. | 1904 to 1982 |
| Odell, William Edward | 1895 to 1976 |
| Odell, Adelaid (Fralick) | 1897 to 1974 |
| Ogilvie, Annabelle H. | died 1989 |
| Ogilvie, Arcola Olive (Wheeler) (PDF) | 1923 to 2004 |
| Ogilvie, Brenda C. (Cahill) (PDF) | 1960 to 2022 |
| Ogilvie, Charles Richard | 1914 to 1988 |
| Ogilvie, Edward P. | 1937 to 1977 |
| Ogilvie, Eldon Prescott | 1916 to 1996 |
| Ogilvie, Evelyn Whitcomb (Green) (PDF) | 1915 to 2002 |
| Ogilvie, Mae (Desmond) | 1888 to 1955 |
| Ogilvie, Parker Clifford | 1907 to 1975 |
| Ogilvie, Parker Rogue | 1882 to 1968 |
| Ogilvie, Rachael Claire | 1883 to 1983 |
| Ogilvie, Ralph Leland | 1911 to 1990 |
| Oldenquist, Angelina M (Lombardo) (PDF) | 1934 to 2018 |
| Oldenquist, Christa Elizabeth (PDF) | 1986 to 2002 |
| Oldenquist, Daniel R. Sr. (PDF) | 1956 to 2013 |
| Oldenquist, William H. (PDF) | 1933 to 1993 |
| O'Loughlin, John J. (PDF) | 1917 to 2011 |
| O'Loughlin, Laura Marie (Morel) (PDF) | 1917 to 2014 |
| Olsen, Richard A. (PDF) | 1947 to 2010 |
| Olson, Dorothy Jeanne | died 1990 |
| Olson, Ernest Martin (PDF) | 1918 to 2004 |
| Osborne, Doris E (Hartwell) (PDF) | 1927 to 2006 |
| Osborne, John Henry MD | 1848 to 1896 |
| Osborne, Mary Fannie (Little) | 1850 to 1926 |
| Owen, Joseph A. (PDF) | 1937 to 2022 |
| Owen, Joseph A, Jr. (PDF) | 1960 to 2020 |
| Owen, Lillian Lydia | 1806 to 1985 |
| Owens, George Robert (PDF) | 1916 to 1998 |
| Owens, Liselotte Elsa | 1922 to 1975 |
