| O'Brian | John David | 29 Aug 1935 - 18 Apr 1991 M/Sgt US Air Force Vietnam | Row 13 N |
| Oldfield | Jess W. | 31 Jul 1901 - 8 Sep 1986 born in Wiseman, Arkansas | Row 18 S |
| Oldfield | Ora Dawson | 19 Mar 1901 - 1 Jun 1990 w/o J.W. born Greer County, Oklahoma Territory | Row 18 S |
| Oldfield | Thomas L. | 1 Aug 1926 - 13 Feb 1998 US Coast Guard WWII | Row 18 S |
| Onstott | Florence | 1869-1932 | Row 12 S |
| Onstott | Francis M. | 27 May 1874 - 1 Nov 1916 | Row 12 S |
| Owings | A.D. | 1841-1922 | Row 7 S |
| Owings | Mary J. | 3 Sep 1849 - 4 Jan 1909 w/o A.D. | Row 7 S |