| Thomas M. O'BRIEN (1829-1892) | & | Mary Elizabeth PORTER (????-????) |
| Thomas M. O'BRIEN (1829-1892) | & | Virginia P. BOWDON (1845-1922) |
| Thomas M. O'BRIEN (1829-1892) | & | Mary Elizabeth PORTER (????-????) |
| Thomas M. O'BRIEN (1829-1892) | & | Virginia P. BOWDON (1845-1922) |
| Jeremiah O'HANLON (1790-1867) | & | Margaret SCANLON (1793-????) |
| Jose Narciso ORTEGA (1884-1937) | & | Doloritas MONTOYA (1885-1976) |
| Daniel Newcomb OSTRANDER (1832-????) | & | Ermina BUCK (1838-????) |
| Peter S. OSTRANDER (1815-1885) | & | Catherine REED (1822-????) |