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Individual's Given & Surname | Birth Year & Place | Marriage Year & Place | Spouse's Name | Birth Year & Place | Chart |
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O | Edward Thomas | | | 1888 | San Antonio, Bexar, TX | Roberta Alice King | 1866 | AL | 42 133a.1 |
| O'Brien | ____ | | | | | Fay A. (Peggy) Mauck | 1917 | | 63 1.1.5 |
| O'Brien | William R. | | | | | Clara Bell Eichel | 1900 | | 41 1321.1311 |
| O'Dell | Sarah E. | | | 1906 | Dawn, MO | George Kuhn | 1838 | Bolivar, OH | 28 1438 |
| O'Farrell | Catherine | | | | | Michael Mock, Jr. | 1764 | Richmond | 03 1.5 |
| O'Leary | Robert | | | | | Romola McAvoy | | | 09 1224 |
| O'Neal | James | 1852 | | | | | | | 77 15c1 |
| O'Neal | Rebecca | 1855 | | | | | | | 77 15c2 |
| O'Neal | Richard | 1857 | | | | | | | 77 15c3 |
| OČNeal | Henry | | | 1848 | Wash. Co. KY | Susan D. Mock | 1838 | KY | 77 1.5.c |
| Oaksin | Charles | | | | | | | | 08 1243.6 |
| Oaksin | George Washington | | | 1854 | Clearfield Co., PA | Elizabeth Mock | 1833 | Bedford Co., PA | 08 1243 |
| Oaksin | George | | | | | | | | 08 1243.8 |
| Oaksin | Gideon | | | | | | | | 08 1243.7 |
| Oaksin | John | | | | | | | | 08 1243.5 |
| Oaksin | Joseph | | | | | | | | 08 1243.4 |
| Oaksin | Mary | | | | | | | | 08 1243.3 |
| Oaksin | Phineas | | | | | | | | 08 1243.1 |
| Oaksin | William | | | | | | | | 08 1243.9 |
| Oaksind | Amanda | | | | | | | | 08 1243.2 |
| Oatwart | Catherine | 1814 | Montgomery Co, VA | 1839 | Clark Co., OH | Esrom (Eison) Mock | 1814 | KY | 52 1.5 |
| Oberlin | Eva Christina | 1741 | Brickerville, Lancaster Co.,PA | 1763 | Heidelburg Twp, PA | Henry Mock | | | 06 1 |
| Offutt | ____ | | | | | Amanda Mock | 1839 | KY | 41 1722.5 |
| Ogden | Carlos A. | 1855 | Edgar Co., IL | 1893 | Clark Co. IL | Nellie Snavely | | | 38 1351 |
| Ogden | Ethel May | | | 1907 | | Samuel Leroy Wright | 1884 | Clinton, OH | 03 15b3.7 |
| Ogden | Ivy A. | 1858 | Edgar Co., IL | | | | | | 38 1353 |
| Ogden | Lydia Ann | | | 1847 | | Isaac L. Mock | 1818 | Loudoun Co., VA | 38 1.b |
| Ogden | Mary V. | 1854 | Edgar Co., IL | | | | | | 38 1352 |
| Ogden | Thomas R. | 1829 | Edgar Co., IL | 1853 | Muskingum Co., OH | Cornelia Abigail Hanks | 1830 | Muskingum Co, OH | 38 1.3.5 |
| Oglesbee | Samuel | | | | | Sarah Mock | | | 48 1234 |
| Ohle | Arlene | 1909 | | | | Alva Earl Mauk | 1904 | Griswold, Cass, IA | 37 1114.578 |
| Oldham | Amos | 1881 | | | | | | | 07 1187.4 |
| Oldham | Cluster | | | | | | | | 07 1187.22 |
| Oldham | David | | | | | | | | 07 1187.21 |
| Oldham | Ida Minnie | 1877 | | | | | | | 07 1187.3 |
| Oldham | Irvin Marcus | 1875 | | | | Ida Lightly | | | 07 1187.2 |
| Oldham | Joseph Elmer | 1883 | | | | | | | 07 1187.5 |
| Oldham | Rebecca | | | | | Andrew Mock | 1804 | | 08 1.2.6 |
| Oldham | Sarahanna Catherine | 1873 | | | | Samuel Steele Blair Wallace | 1861 | | 07 1187.1 |
| Oldham | Thomas | 1847 | Bedford Co.,PA | 1872 | Ind. Co. PA | Barbara Mock | 1847 | | 07 1187 |
| Oldham | Torrence | | | | | | | | 07 1187.23 |
| Oliver | Catherine | | | 1823 | | Peter Coppess | 1799 | NC | 48 1213 |
| Oliver | Elizabeth | | | 1838 | | Adam Coppess | 1812 | OH | 48 1219 |
| Oliver | Ida J. | 1863 | Cumberland Valley Twp., Bedford Co., PA | 1879 | | Daniel Walter Mock | 1859 | Cumberland Valley Twp., Bedford Co., PA | 16 1.3.6 |
| Olmacht | Elizabeth | 1776 | | 1796 | Dunningen Wuertenberg, Germany | Carl Joseph Mauch | 1762 | | 78 1.1 |
| Olsen | Alice | | | | | David R. Mock | 1897 | Johnstown, PA | 07 13e1.3 |
| Orcutt | Emmeline | | | | | William Mock | 1828 | Randolph Co., IN | 48 124a |
| Orr | ____ | | | | | Eda (Edith) Mock | | | 76 1.1.5 |
| Orr | Solon B. | | | 1868 | | Harriet Ruhanna Mauk | 1846 | Randolph Co., AL | 41 1754.6 |
| Ortman | James Sanford | | | 1868 | | Nettie Maught | 1852 | | 88 1422 |
| Ortman | William | 1871 | | | | | | | 88 1422.1 |
| Ortz | Emily S. | 1836 | | 1857 | Page Co., VA | John Perry Mauck | 1834 | VA | 40 1261.3 |
| Osbon | Zenith | 1857 | | 1880 | Chester Co, PA | Harry S. Mock | 1862 | West Vincent Twp., Chester Co., PA | 17 1523.3 |
| Osborn | ____ | | | | | William Rowan Mock | 1844 | Putnam Co., IN | 49 1255 |
| Osborn | Rebecca | | | 1859 | | Thomas Mellender Mock | 1831 | NC | 49 1253 |
| Oster | Amanda | 1863 | | | | ____ Conradad | | | 07 1253.2 |
| Oster | Emma | | | | | Sylvester Mock | 1845 | | 07 1862 |
| Oster | Jacob | | | | | Mary Mock | 1828 | | 07 1823 |
| Oster | John H. F. | | | | | Hannah Mary Riddle | 1854 | | 07 1252.2 |
| Oster | Sarah 'Emma' | | | | | George William Riddle | 1856 | | 07 1252.3 |
| Oster | Sarah | 1852 | | 1871 | | David Shaffer | | | 07 1253.1 |
| Oster | Simon Paul | 1850 | | 1877 | | Martha C. Mock | 1850 | Colerain Twp., Bedford Co., PA | 16 1.3.2 |
| Oster | Susan | | | 1853 | | George C. Mock | | | 07 1828 |
| Oster | William | 1830 | | 1850 | | Dorothy "Dolly" Berkheimer | 1829 | | 07 1253 |
| Ott | Agnes | | | | | Johann George Mack | 1685 | | 27a 1.1 |
| Ott | Maria Agnes | 1694 | | | | Johann Georg Mack | 1684 | | 27 1 |
| Ott | William | | | | | Ann Elizabeth Rickard | 1867 | | 40 1223.133 |
| Otto | Betty Jane | | | | | Harold Mauk | 1923 | KS | 37 1114.524 |
| Otto | Betty Jane | | | | | Harold Mauk | 1923 | KS | 55 1452.4 |
| Otto | Mary Ann | | | | | Daniel M. Wonders | | | 07 1361 |
| Otto | Mary Elizabeth | 1874 | Martinsburg, Berkeley, WV | | | Jesse N. Roberts | 1867 | Coles Co., IL | 38 15a2 |
| Over | James Earl | | | | | Barbara Stanbarger Mauk | | | 07 11a3.2 |
| Over | James Earl | 1835 | Osterburg, PA | | | Sarah Mock | 1849 | | 07 11a3 |
| Over | Swell Shanley | | | | | | | | 07 11a3.1 |
| Overmeyer | Frederick | | | | | Sarah Muck | | | 25 1.c |
| Owen | Margaret | 1819 | OH | 1837 | Perry Co., OH | Michael Mauk | 1815 | Perry Co., OH | 37 1123 |
| Owens | Abner | | | | | Sally Ann Sanders | | | 41 1724.1 |
| Owens | Flora Elizabeth | | | 1903 | | Henry Clay Mock | 1844 | Morgan Co., MO | 77 1323 |
| Oyster | Charlotte | 1823 | | 1848 | Stark Co, OH | Jacob "Jake" Mock | 1821 | OH | 29 1.7.6 |
| Ozenbaugh | Leah | 1813 | OH | 1834 | | David Mock | 1807 | Shoenersville, Lehigh, PA | 21 1332 |