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| NAME | SECTION | ACRES | TOWNSHIP NAME | TOWNSHIP | RANGE |
| O Neal, T.K. | 10 | 25 | Harrison | 86 North | 10 West |
| O'Brian, T. | 16 | 80 | Fremont | 83 North | 9 West |
| O'Brien, J. | 16 | 160 | Union | 83 North | 11 West |
| O'Brien, T. | 16 | 80 | Union | 83 North | 11 West |
| O'Brien, T. | 22 | 80 | Union | 83 North | 11 West |
| O'Brien, T. | 32 | 20 | Leroy | 82 North | 11West |
| Obrion, S. | 30 | 80 | Cedar | 86 North | 11 West |
| O'Conner, F. | 4 | 80.07 | Leroy | 82 North | 11West |
| Odell, W.A. | 2 | 80 | Union | 83 North | 11 West |
| Offt, E. | 12 | 159 | Kane | 83 North | 12 West |
| Ogden, W.B. | 4 | 40, 80 | Taylor | 85 North | 10 West |
| Ogden, W.B. | 5 | 86.75 | Taylor | 85 North | 10 West |
| Ogden, W.B. | 9 | 40 | Taylor | 85 North | 10 West |
| Ohda, H. | 15 | 80 | Kane | 83 North | 12 West |
| Ohlen, P. | 14 | 80 | Kane | 83 North | 12 West |
| Oldfather, H. | 9 | 40 | Harrison | 86 North | 10 West |
| Oldfather, J. | 15 | 10 | Harrison | 86 North | 10 West |
| Oleson, K. | 9 | 60 | Florence | 82 North | 9 West |
| Oleson, O. | 29 | 80 | Florence | 82 North | 9 West |
| Oleson, O. Est. | 7 | 80 | Florence | 82 North | 9 West |
| Oleson, O. Jr. | 28 | 80 | Florence | 82 North | 9 West |
| Oleson, P. | 30 | 118 | Fremont | 83 North | 9 West |
| Oleson, R. | 19 | 80 | Leroy | 82 North | 11West |
| Oleson, S. | 7 | 40.23 | Florence | 82 North | 9 West |
| Olncy, D. | 30 | 80 | Fremont | 83 North | 9 West |
| Olney, G.W. | 23 | 40 | Florence | 82 North | 9 West |
| Olson, K. | 9 | 80 | Florence | 82 North | 9 West |
| Omrig, T.J. | 6 | Florence | 82 North | 9 West | |
| Omrig, T.J. | 7 | 159.295 | Florence | 82 North | 9 West |
| O'Neal, T.K. | 18 | 63 | Polk | 86 North | 9 West |
| O'Neal, T.K. | 19 | 142.53 | Polk | 86 North | 9 West |
| Ophiam, A. | 7 | 39.5 | Florence | 82 North | 9 West |
| Oppilt, C.H. | 1 | 134.65 | Jackson | 85 North | 11 West |
| Oppilt, F. | 1 | 48.69 | Jackson | 85 North | 11 West |
| Ordman | 14 | 80 | Kane | 83 North | 12 West |
| Oren, J. | 3 | 80 | Cedar | 86 North | 11 West |
| Orphans Church | 16 | 40 | Florence | 82 North | 9 West |
| Orton, F. | 15 | 160 | Big Grove | 84 North | 11 West |
| Osborn, J.M. | 33 | 40 | Florence | 82 North | 9 West |
| Osborn, T.F. | 1 | 80 | Polk | 86 North | 9 West |
| Osborn, T.F. | 2 | 80 | Polk | 86 North | 9 West |
| Osborn, T.F. | 2 | Polk | 86 North | 9 West | |
| Osgood & Heskell | 4 | 40 | Big Grove | 84 North | 11 West |
| Osgood, A.P. | 1 | 40 | Florence | 82 North | 9 West |
| Osterkamp, H. | 22 | 320 | Eldorado | 83 North | 10 West |
| Ott, W.G. | 35 | 80 | Monroe | 85 North | 12 West |
| Outland, J.E. | 9 | 80 | Union | 83 North | 11 West |
| Owen, J.P. | 24 | 80 | Leroy | 82 North | 11West |
| Owen, J.P. | 34 | 40 | Leroy | 82 North | 11West |
| Owens, J. | 1 | 330.86 | Fremont | 83 North | 9 West |
| Oyer, J. | 1 | 160 | Fremont | 83 North | 9 West |
| Oyer, J. | 2 | 160 | Fremont | 83 North | 9 West |
| Oyer, J. | 11 | 40 | Fremont | 83 North | 9 West |
| Oyer, J. | 12 | 80, 80 | Fremont | 83 North | 9 West |
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