| Name | Birth date | Birth location | Death date | Death location |
| OLDHAM, Mary Ann | WFT Est. 1731-1758 | | 1813 | |
| OLDHAM, Mollie Gertrude | December 04, 1876 | | February 26, 1936 | Greenfield, Indiana |
| OLDHAM, Moses | WFT Est. 1689-1711 | | WFT Est. 1723-1793 | |
| OLDHAM, Moses | WFT Est. 1719-1761 | | WFT Est. 1755-1839 | Montgomery County, Tennesse |
| OLDHAM, Moses | 1776 | Virginia | June 1853 | Wabash County, Indiana |
| OLDHAM, Myrtle May | December 20, 1883 | | April 25, 1908 | |
| OLDHAM, Nancy | WFT Est. 1731-1758 | | WFT Est. 1763-1841 | |
| OLDHAM, Nancy | WFT Est. 1758-1801 | | WFT Est. 1771-1882 | |
| OLDHAM, Nancy | WFT Est. 1807-1835 | | WFT Est. 1812-1917 | Missouri |
| OLDHAM, Nancy Helen | December 22, 1838 | Hancock County, Indiana | October 08, 1900 | Linn County, Kansas |
| OLDHAM, Norman E. | Private | | | |
| OLDHAM, Paul Tharp | December 20, 1890 | | October 21, 1961 | |
| OLDHAM, Richard | March 01, 1744/45 | Fauquier County, Virginia | 1834 | Estill County, Kentucky |
| OLDHAM, Richard | WFT Est. 1690-1712 | Virginia | 1785 | Caswell County, North Carolina |
| OLDHAM, Richard Lee | Private | | | |
| OLDHAM, Robert Edward | March 27, 1894 | | February 12, 1985 | |
| OLDHAM, Robert Samuel Newton | March 01, 1851 | Charlottesville, Indiana Hancock County | November 19, 1930 | Greenfield, Indiana |
| OLDHAM, Roger Jay | Private | | | |
| OLDHAM, Ruth | 1738 | | 1807 | Georgia ? |
| OLDHAM, Samuel | March 15, 1823 | Fayette County, Indiana | February 05, 1907 | Kane County, Illinois |
| OLDHAM, Samuel | 1749 | | 1825 | |
| OLDHAM, Sarah | WFT Est. 1775-1794 | | WFT Est. 1810-1879 | |
| OLDHAM, Sarah | 1821 | Indiana | December 14, 1875 | Saline County, Missouri |
| OLDHAM, Sarah | WFT Est. 1758-1801 | | WFT Est. 1791-1882 | |
| OLDHAM, Stephen | November 10, 1774 | Virginia | May 14, 1834 | Fayette County, Indiana |
| OLDHAM, Steve | Private | | | |
| OLDHAM, Susannah | January 01, 1745/46 | Westmoreland County, Virginia | 1818 | Jefferson County, Kentucky |
| OLDHAM, Todd Gordon | Private | | | |
| OLDHAM, William | WFT Est. 1689-1711 | | WFT Est. 1695-1793 | |
| OLDHAM, William | June 17, 1755 | | November 04, 1791 | |
| OLDHAM, William | June 05, 1783 | Caswell County, North Carolina | October 23, 1862 | Wapella County, Iowa |
| OLDHAM, William | April 28, 1811 | Sevier County, Tennesse | April 29, 1887 | Hancock County, Indiana |
| OLDHAM, William | April 28, 1886 | | September 27, 1943 | |
| OLDHAM, William Robert | Private | | | |
| OLDHAM, Winifred | 1736 | | 1797 | Pittsburg, Pennsylvania |
| O'LEARY, Dorothy | Private | | | |
| OLIVER, Ida Belle | July 01, 1862 | Michigan City, LaPorte County,IN | Unknown | |
| OLLILA, William | Unknown | ? | Unknown | ? |
| OLSON, Gordon Thomas | Private | | | |
| OLSON, Rachel Lynn | Private | | | |
| OLSON, Tyler James | Private | | | |
| ONOT, ?husband of Kate maxwell? | Aft. 1815 | | Unknown | |
| OPSETH, Julie | Private | | | |
| ORDIWAY, Amber Jade | Private | | | |
| ORDIWAY, Milphard | Private | | | |
| ORDIWAY, Nicholaus Jay | Private | | | |
| ORDIWAY, William Jon | Private | | | |
| ORR, John | Abt. 1843 | | Unknown | |
| ORR, Julia May | WFT Est. 1876-1899 | | WFT Est. 1919-1988 | |
| OSBON, Brian | Private | | | |