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| Bride | Groom | Note | Date |
| O'Brieen, Ann | Clark, Nicholas | lic | 2-2-1870 |
| Oft, Amie | Jurgonsen, Amos | 1-29-1879 | |
| Oft, Lena | Kiebach, E. | 2-25-1875 | |
| Okley, Harriet J. | Merritt, George A. | 2-21-1873 | |
| Oldaker, Sara | Clure, Joseph | 6-20-1869 | |
| Olds, Harriot G. | Hess, Philip G. | 10-20-1867 | |
| Oleson, Julia | Mason, Thomas | 1-27-1872 | |
| Olifield, Eva | Hunter, Henry | 1-20-1870 | |
| Olney, Ellen | Brown, Robert B. | 9-29-1867 | |
| Olney, Emma J. | Leatherman, Joseph B. | 9-30-1868 | |
| Olsen, Tallete K. | Larsen, Bjorn | 3-10-1879 | |
| Olson, Anna C. | Johnson, John K. | 8-9-1867 | |
| Olson, Augusta | Anderson, Mannal A. | 12-29-1876 | |
| Olson, Rachel | Knutson, Knut | 11-14-1873 | |
| Onstott, Sarah Ann | Corderey, David | 12-24-1864 | |
| Oppelt, Amelia | Gillett, Joseph S. | 10-14-1860 | |
| Ormswig, Bertha T. | Madson, George | 10-12-1866 | |
| Osborn, Nany J. | Buchan, John A. | 1-1-1870 | |
| Osborne, Harriette | Boyles, George W. | 6-25-1868 | |
| Osborne, Sarah A. | Evans, Frank D. | 10-30-1878 | |
| Owens, Lucy Jane | Miller, Ira G. | 11-4-1869 | |
| Owlan, Catherine | Gavin, Patrick | 7-17-1870 | |
| Oyler, Eliza J. | Hamilton, Samuel R. | 4-10-1866 |
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