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| Groom | Bride | Note | Date |
| Oakland, John | Larson, Martha | 2-19-1869 | |
| Oakley, W. J. | Phillips, Edith E. | 8-24-1874 | |
| Oaklund, Nels P. | Ellingson, Margaret | 12-10-1874 | |
| Oberlander, Samuel | Churchill, May | 5-1-1863 | |
| O'Brien, Thomas | Ellis, Esther | 12-15-1874 | |
| Odell, C. W. | Williams, Mamie | 12-25-1872 | |
| Ogier, G. R. | Stauffer, Emma | 4-8-1875 |
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