| Names/Ages | Marriage Date | Book/Page # |
| O'NEAL, Forest 21 GILL, N Miss 18 | 13 Mar 1883 | A-053 |
| OGLESBY, Betty Mrs 31 WATSON, A J 27 | 11 Feb 1886 | A-226 |
| OLIVER, J E 35 ROWLES, Alice 25 | 8 Jun 1887 | A-291 |
| OPOLON, W H 40 HASKINS, M A Mrs 38 | 15 Sep 1883 | A-075 |
| OPPELO, Annie 16 MUSSER, Frank 30 | 17 Dec 1882 | A-029 |
| ORENDORFF, Mary A 26 LINDSAY, O J 39 | 8 Jan 1888 | A-332 |
| ORR, W T 21 SMITH, Callie 16 | 21 Jul 1887 | A-297 |
| OSTERKAMP, Tobias 28 WELLINGHOFF, Lizzie 22 | 12 Nov 1883 | A-086 |
| OUTLARD, L J Miss 28 NIX, B F 28 | 24 Nov 1885 | A-211 |
| OWENS, Henrietta Mrs 30 JOHNSON, Joseph 39 | 8 Mar 1885 | A-165 |
| OWENS, Lucinda 18 KEET, Hawk 22 | 31 Aug 1886 | A-257 |