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Individual's Given & Surname | Birth Year & Place | Marriage Year & Place | Spouse's Name | Birth Year & Place | Chart |
| |
O. D. | Mock | | | | | | | | 00 1213.6711 |
| Ode | Mauk | | | | | | | | 37 1114.516 |
| Ode | Mauk | | | | | | | | 55 1451.6 |
| Oipha | Mack | 1893 | | | | | | | 29 1113.35 |
| Oletha | Muck | | | | | | | | 30 1113.76 |
| Olive (M. Olive) | Mock | 1890 | PA | | | Leroy Druckenmiller | 1886 | | 17 1524.21 |
| Olive Ada | Mock | | | | | | | | 08 111a.41 |
| Olive Ann | Mauk | 1866 | | | | | | | 37 1114.55 |
| Olive Ann | Mauk | 1866 | | | | | | | 55 1455 |
| Oliver | Mock | 1833 | Union, Berks Co., PA | 1854 | Berks Co., PA | Sarah Ann ____ | 1827 | | 12 1.7.4 |
| Oliver | Mock | 1849 | | | | | | | 42 11c1.2 |
| Oliver | Mock | 1872 | | | | Sara Burkett | | | 07 1655.1 |
| Oliver | Mock | 1872 | Imler, King Twp., Bedford Co, PA | | | Sarah M. Burkett | 1870 | | 07 1686.3 |
| Oliver | Mock | 1873 | | | | | | | 29 1837 |
| Oliver Alfred | Mauck | 1868 | | 1896 | | Emma E. Bottles Cline | 1867 | | 39 1151.17 |
| Oliver H. S. | Mock | 1846 | IA | 1870 | | Sarah E. Hollingshead | | | 41 1351.b |
| Oliver Henry | Mauck | 1823 | Page Co., VA | | | | | | 36 1.1.3 |
| Oliver Herschel | Mock | 1898 | | 1927 | Kentland, Newton Co., IN | Selma Ruth Hooker | 1906 | Kentland, Newton Co., IN | 48 1247.23 |
| Oliver Louis | Mock | | | | | | | | 00 1213.671 |
| Oliver Mathias | Mauk | 1867 | Martinsville, Clark, IL | | | Kansie Sharp | | | 37 1114.34 |
| Oliver Mathias | Mauk | 1867 | Martinsville, Clark, IL | | | Kansie Sharp | | | 55 1434 |
| Oliver Perry Morton | Mock | 1876 | Warsaw, Benton Co., MO | 1898 | Sheridan Co., WY | Etta Sayer | 1875 | | 77 1311.6 |
| Oliver R. | Mock | 1882 | | | | Bessie Wertz (2) | | | 07 1131.22 |
| Oliver R. | Mock | 1882 | | | | Pearl Keith (1) | | | 07 1131.22 |
| Oliver Ray | Mock | 1881 | Pleasant Valley, Harper, KS | | | | | | 49 1615.3 |
| Oliver S. | Mock | 1869 | Albia, Monroe Co., IA | | | | | | 41 1351.65 |
| Oliver Sherman | Mock | 1880 | | | | | | | 07 1922.2 |
| Oliver, Jr. | Mock | 1824 | SC | | | Isabelle McWilliams (1) | 1832 | | 42 11c1 |
| Oliver, Jr. | Mock | 1824 | SC | 1857 | Adams Co., MS | Cornelia Mock (2) | 1840 | | 42 11c1 |
| Oliver, Sr. | Mock | 1793 | | | | Elizabeth Havard | 1796 | | 42 1.1.c |
| Ollie | Mauk | 1872 | | | | | | | 09 1.4 |
| Ollie Lee | Mauck | 1897 | Atlanta, Fulton, GA | | | Thomas Byron Reynolds (2) | | | 36 1114.8 |
| Ollie Lee | Mauck | 1897 | Atlanta, Fulton, GA | 1922 | | James Boyd Perry (1) | | | 36 1114.8 |
| Omar Felix | Mock | 1848 | | | | | | | 08 1247 |
| Ona | Mock | 1867 | Hancock Co., IL | | | | | | 41 1392.32 |
| Opal Ruth | Mauck | | | | | | | | 35a 1254.6 |
| Ophelia | Mock | 1877 | | 1908 | | John C. Mock | | | 44 2352.2 |
| Ora "James" | Mauk | 1924 | Co., KS | | | Maxine ____ | | | 55 1452.5 |
| Ora | Mauk | 1893 | | | | | | | 39 1232.1c |
| Ora | Mauk | 1893 | | | | | | | 55 1457.2 |
| Ora Leveda | Mock | 1849 | Loudoun Co., VA | 1873 | | George W. Adams | 1841 | Loudoun Co., VA | 38 1.c.6 |
| Orlando | Mock | 1857 | OH | | | | | | 03 15a9 |
| Orlando | Mock | 1861 | | | | | | | 07 13b5 |
| Orlena Marie | Mauck | | | | | Edward Arthur Millis | | | 40 1222.1616 |
| Orpha | Mock | | | | | William Chess | | | 17 1124.3 |
| Orrie Eugenia | Mock | | | | | Perry D. Durham | | | 45 1236.2321 |
| Orrison Sigsbee | Mock | 1898 | Monroe Mill, FL | | | Ida Penton | | | 43 1185 |
| Orval Vernon | Mauk | 1894 | | | | | | | 55 1457.3 |
| Orval Vernon | Mauk | 1894 | Silver City, Pottawattamie, IA | | | Beulah E. Shindley | 1900 | | 37 1114.573 |
| Orvel | Mauk | 1921 | Atlantic, IA | | | | | | 37 1114.5732 |
| Orvel Junior | Mauk | 1921 | Atlantic, IA | | | | | | 55 1457.31 |
| Orville | Mock | 1878 | | | | | | | 41 1321.242 |
| Oscar | Mauk | | | | | | | | 26 1131.4 |
| Oscar Bailey | Mock | 1875 | Coles Co., IL | | | | | | 38 1924 |
| Oscar E. | Mock | 1893 | | | | | | | 07 1131.28 |
| Oscar Franklin | Mock | 1871 | Loudoun Co., VA | | | Lena Mozella Harper | 1879 | Loudoun Co., VA | 38 2733 |
| Oscar Henry | Mock | 1879 | MO | | | Lelia Parker | | | 49 1257.1 |
| Oscar Rubin | Mack | 1863 | | | | | | | 21 1313.36 |
| Oterbine | Mauk | 1864 | | | | | | | 37 1114.54 |
| Oterbine | Mauk | 1864 | | | | | | | 55 1454 |
| Otho | Mock | 1878 | | | | | | | 77 1314.2 |
| Otis | Mauk | 1903 | | | | | | | 08 1228.47 |
| Otis Marion | Mock | 1899 | Pocahontas, AR | | | Georgia Meredith | | | 45 1236.432c |
| Ottie | Mock | 1878 | | | | | | | 32 1161.31 |
| Ottilia | Mack | 1876 | Langenau, Wurttemberg, Germany | | | | | | 45a 113d.2874 |
| Owen E. | Mock | 1877 | | | | | | | 44 2317.5 |