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| Name | Township or City | Date | Rank | Unit |
| O'Brien, Terrence | Mitchell | December 30, 1861 | Enlisted | Co. E 17th Regiment Infantry |
| O'Conner, Bartholomew | Lima | October 9, 1861 | Enlisted | Co. E 17th Regiment Infantry |
| O'Connor, Timothy | Lima | April 25, 1861 | Enlisted | Co. C 4th Regiment Cavalry |
| O'Melia, John | Mitchell | November 6, 1861 | Enlisted | Co. E 17th Regiment Infantry |
| O'Neil Simon P. | Plymouth | Enlisted | 37th Regiment Infantry | |
| O'Neil, Daniel E. | Greenbush | July 31, 1861 | Enlisted | Co. B 8th Regiment Infantry |
| Oatman, Daniel | Franklin | Enlisted | Permanent Guard, Wisconsin Infantry | |
| Obrink, Bern H. | Holland | August 21, 1862 | Enlisted | Co. F |
| Odell, Thomas M. | Russell | June 1, 1861 | Enlisted | Co. B 8th Regiment Infantry |
| Odell, Zachariah | Russell | June 1, 1861 | Enlisted | Co. B 8th Regiment Infantry |
| Oehlmann, William | Sheboygan | April 21, 1861 | Enlisted | Co. C 4th Regiment Cavalry |
| Offenbacher, John | Sheboygan | September 22, 1861 | Enlisted | Co. A 9th Regiment Infantry |
| Ogle, F. Clay | Scott | September 17, 1861 | Enlisted | Company I |
| Ohlmann William | Sheboygan | Enlisted | 37th Regiment Infantry | |
| Oliver, James K. | Scott | August 21, 1862 | Enlisted | Co. F |
| Oliver, William H. | Sheboygan Falls | November 6, 1863 | Enlisted | Co. C 4th Regiment Cavalry |
| Onk, John G. | Holland | Enlisted | 6th Regiment Infantry | |
| Oonk, John | Holland | October 3, 1861 | Enlisted | Company I |
| Orlebeke, William | Holland | Enlisted | 6th Regiment Infantry | |
| Orphal, Theodore | Sheboygan Falls | June 3, 1864 | Enlisted | Co. D 39th Regiment Infantry |
| Orphal, Theodore | Plymouth | January 13, 1865 | Enlisted | Co. H 14th Regiment Infantry |
| Ortmayer, Anthony | Plymouth | August 19, 1862 | Enlisted | Co B 27th Regiment Infantry |
| Osier Joseph | Sheboygan | Enlisted | 37th Regiment Infantry | |
| Osthelder, Joseph | Sheboygan Falls | April 21, 1861 | Enlisted | Co. C 4th Regiment Cavalry |
| Ostrander, Charles E. | August 13, 1862 | Enlisted | Co. E | |
| Ott, Theodore | Sheboygan Falls | September 16, 1861 | Enlisted | Co. H 1st Regiment Infantry |
| Otte, Julius | Sheboygan | October 30, 1861 | Enlisted | Co. A 9th Regiment Infantry |
| Otte, Louis | Sheboygan | September 13, 1861 | Enlisted | Co. A 9th Regiment Infantry |
| Ottensmann, Fritz | Sheboygan | Enlisted | 6th Regiment Infantry | |
| Ottman George | Franklin | Enlisted | 37th Regiment Infantry | |
| Otto, August | Wilson | August 21, 1862 | Enlisted | Co. E |
| Owerbeck, Ludwig | Sheboygan | August 15, 1862 | Enlisted | Co. H 26th Regiment Infantry |
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