| Robert Franklin OATES (1818-1878) | & | Sarah MATTHEWS (1828-1911) |
| Stephen Moses OATES (1849-1930) | & | Emmaline CAMERON (????-1872) |
| Stephen Moses OATES (1849-1930) | & | Margaret Ann WILSON (1853-1929) |
| Luke O'BRIEN (1827-1907) | & | Mary Gertrude BOTTS (1835-1887) |
| Johann Nikolaus OCHS (1816-????) | & | Johanne Lisette KOENIG (1827-????) |
| Alphonso Forney O'DANIEL (1854-1935) | & | Dora M. GHIE (1859-1927) |
| Aaron Lewis ODEN (1807-1889) | & | Mahala COLLINS (1807-1890) |
| Timothy S. ODEN (1840-1884) | & | Margarete A. SMITH (1845-1928) |
| John Powers OFFIELD (1841-1910) | & | Mary Ann BOWNDS (1850-1920) |
| Sabert OGLESBY (1833-????) | & | Nancy HILL (1839-1895) |
| Henry Goodwin O'KEEFE (1906-1962) | & | Willie Mae Ola BAGGETT (1907-1986) |
| Maunel OLIVARES (1881-1938) | & | Fernanda LOPEZ (1875-1974) |
| Iver OLSEN (1858-1929) | & | Oline HAGEN (1866-1950) |
| Gustav "Gus" ONCKEN (1886-1961) | & | Sarah Izora McMILLAN (1889-1963) |
| Frank Sylvester O'NEAL (1886-1938) | & | Clarinda Mae SPARKS (1891-1986) |
| James Reuben O'NEAL (1860-1943) | & | Eula Mae WALKER (1863-1941) |
| Reuben O'NEAL (1825-1909) | & | Mary F RIGBY (1830-1870) |
| Lonnie Dolphus ONEY (1893-1965) | & | Cordie CRAVER (1893-1992) |
| John A. OPRY (1855-1941) | & | Mary Roslyn "Ross" BOON (1851-1895) |
| James ORENBAUM (1876-1973) | & | Nettie WALKER (????-????) |
| John Charters ORGAN (1815-1860) | & | Elizabeth STONE (1810-1893) |
| Joseph Haulsey ORGAN (1853-1915) | & | Anna Elizabeth NULL (1855-1904) |
| Simpson Augustus ORGAN (1850-1897) | & | Priscilla Angeline WILSON (1850-1910) |
| George Alexander ORMSBY (1864-1943) | & | Florance Alice CORBELL (1867-1889) |
| George Alexander ORMSBY (1864-1943) | & | Nancy Jane FREEMAN (1866-1892) |
| George Alexander ORMSBY (1864-1943) | & | L. M. MASON (1874-1931) |
| George Clark ORNBOM (1824-1894) | & | Mary Elizabeth REAVIS (1842-1906) |
| Eugene ORNDORFF (1858-????) | & | Margaret LINTON (1862-????) |
| James Franklin OSBORN (1863-1953) | & | Sarah BEAUCHAMP (1865-1898) |
| Francis Marion OSBORNE (1824-1996) | & | Serepta ELLIOTT (1830-1868) |
| Francis Marion OSBORNE (1824-1896) | & | Mary MIRACLE (1840-1896) |
| Thomas Boyd OSBORNE (1887-1971) | & | Auda Loraine WILLIAMS (1906-1967) |
| Thomas F. OSBORNE (1873-1911) | & | Connie Mae WHALEY (1883-1963) |
| William Nutter OSBORNE (1842-1908) | & | Nancy Jane STURDIVANT (1852-1930) |
| Hans Rudolf OTT (1839-1892) | & | Elizabeth WIDMER (1837-????) |
| Dr. Henry P Overbay (1822-1880) | & | Penina E Henderson (1842-1870) |
| Jesse Everett OVERTON (1905-1947) | & | Rhoda Elaine TOWER (1913-1993) |
| Edmund Agustus Merryman OWEN (1863-1937) | & | Julia Catherine Nell SLAVEN (1873-1951) |
| Ezekiel OWEN (1787-1849) | & | Volley BURLESON (1795-1850) |
| H Hirsch Ezekiel OWEN (1829-????) | & | Julia Ann Francis WILKES (1828-????) |
| James Ethelyn OWEN (1866-1917) | & | Ada Tennessee LINDER (1882-1964) |
| John Stanhope OWEN (1865-1953) | & | Nancy Olive TEAGLE (1872-1906) |
| William R. OWENS (1857-1890) | & | Mary Elisabeth OSBORNE (1855-????) |
| Lemuel R. OXFORD (1823-1878) | & | Elizabeth WALTERS (1825-????) |