| Name | Birth date | Death date | Marriage date | Spouse | Birth location | Death location |
|---|
| O'MARA, Ann | 12/25/1825 | 8/28/1906 | 1849 | O'BRIEN, James | County Tipperary, Ireland | |
| O'MARA, Anna | | | | | | |
| O'MARA, Bridget | | | | | | |
| O'MARA, Catherine | | Abt. 1847 | | O'BRIEN, John | Ireland | At sea |
| O'MARA, Daniel | | 1888 | | DEARCY, Margaret | | Kenockee Twp., St. Clair County, Michigan |
| O'MARA, Edward | | | | | | |
| O'MARA, Eliza | | | | | | |
| O'MARA, Ella | | | | | | |
| O'MARA, James | | | | | | |
| O'MARA, James | 1840 | | 1/9/1876 | CASEY, Johanna | Tipperary | |
| O'MARA, John | | | | | | |
| O'MARA, John | | | | | | |
| O'MARA, Josephine | | | | | | |
| O'MARA, Louisa | | | | | | |
| O'MARA, Margaret | | | | | | |
| O'MARA, Mary | | | | | | |
| O'MARA, Mary | | | | | | |
| O'MARA, Patrick | | | | | | |
| O'MARA, Theresa | | | | | | |
| O'MARA, William | | | | | | |
| O'MARA, William | | | | | | |
| OMER, Jason | 9/7/1973 | | | | | |
| O'NIEL, Agnes | Abt. 1925 | | | MONTIGNY, D. E. | Douglas, Ontario | |
| O'NIEL, Catherine | 5/5/1821 | 10/12/1905 | | ENRIGHT, Dennis | Ireland | East Grand Forks, MN |
| O'NIEL, Jerimiah | | | | FOLEY, Mary | | |
| O'NIEL, John | 1799 | 12/19/1891 | 1820 | O'DRISCOLL, Mary | Ireland | East Grand Forks, MN |
| OPERSTENY, ? | | | | HOLUBEC, Veronica | | |
| OPERSTENY, Adolph | | | | | | |
| OPERSTENY, Francis | | | | | | |
| OPERSTENY, Frank | | | | | | |
| OPERSTENY, Joe | | | | | | |
| OPERSTENY, Josephine | | | | | | |
| OPERSTENY, Louis | | | | | | |
| OPERSTENY, Mary | | | | | | |
| OPERSTENY, Victoria | | | | | | |
| OPERSTENY, Willie | | | | | | |
| ORENDORFF, ? | | | | ? | | |
| ORENDORFF, Agnes Gertrude | 1/17/1910 | | | MEYERS, Reg | | |
| ORENDORFF, Allan Ross | 2/14/1952 | | | | | |
| ORENDORFF, Ambrose | | | | | Germany | |
| ORENDORFF, Ann (Arah Ann) | 9/24/1943 | 1/15/1993 | | | London Ontario | London, Ontario |
| ORENDORFF, Arthur Austin | 6/9/1907 | | | PRIMEAU, Eva Anna | | |
| ORENDORFF, Arthur William | 4/16/1875 | 7/18/1954 | 5/17/1899 | SENSABAUGH, Verna Lazelle | | |
| ORENDORFF, Austin (Bud) | | | | EYTH, Rosemary | | |
| ORENDORFF, Austin Ambrose | 9/19/1880 | 1937 | | ROCHE, Clara Celestine | London, Ontario | London, Ontario St. Peter's Cemetery |
| ORENDORFF, Austin Ambrose | 1/22/1908 | | 7/2/1932 | CROSS, Marie | | |
| ORENDORFF, Barret | | | | GRABUS, Barbara | | |
| ORENDORFF, Betsy | 1961 | | | | | |
| ORENDORFF, Brian | | | | | | |
| ORENDORFF, Cecil Vincent | 7/28/1905 | 8/28/1905 | | | | |
