| Name | Line | Page | District | Soundex
| Olaffson, Ella | 74 | 4B | 234 | O412
| | Olding, Charles | 23 | 1A | 234 | O435
| | Oldroyd, T. J. | 87 | 5B | 211 | O436
| | Oleson, Chris F. | 59 | 10B | 211 | O425
| | Oleson, Ed. | 86 | 2B | 211 | O425
| | Oleson, Floyd | 1 | 9A | 210 | O425
| | Oleson, Lorin | 52 | 6B | 197 | O425
| | Olivear, Chas. | 28 | 13A | 212 | O416
| | Oliver, Chas. | 79 | 11B | 212 | O416
| | Oliver, James A. | 11 | 2A | 209 | O416
| | Oliver, William A. | 28 | 3A | 210 | O416
| | Ollertson, Mary E. | 45 | 7A | 210 | O463
| | Olpin, Albert H. | 2 | 6A | 203 | O415
| | Olpin, Alma J. | 81 | 4B | 203 | O415
| | Olpin, Edwin D. | 87 | 5B | 203 | O415
| | Olsen, Adolph | 67 | 12B | 207 | O425
| | Olsen, Albert | 76 | 4B | 214 | O425
| | Olsen, Ammon | 30 | 3A | 188 | O425
| | Olsen, Ammon | 14 | 7A | 188 | O425
| | Olsen, Andrew | 72 | 3B | 202 | O425
| | Olsen, Boletta | 74 | 5B | 218 | O425
| | Olsen, Carl | 78 | 10B | 198 | O425
| | Olsen, Charles M. | 61 | 10B | 190 | O425
| | Olsen, Chris D. | 27 | 6A | 215 | O425
| | Olsen, Christina | 76 | 2B | 215 | O425
| | Olsen, Clifford | 24 | 1A | 204 | O425
| | Olsen, Clyde L. | 58 | 4B | 202 | O425
| | Olsen, Elsie | 77 | 10B | 198 | O425
| | Olsen, Eugene A. | 75 | 7B | 208 | O425
| | Olsen, Ferdinand H. | 52 | 14B | 209 | O425
| | Olsen, Floy | 57 | 4B | 202 | O425
| | Olsen, Frank | 66 | 8B | 202 | O425
| | Olsen, George | 70 | 5B | 201 | O425
| | Olsen, Gilbert | 18 | 4A | 215 | O425
| | Olsen, Hans E. | 60 | 3B | 186 | O425
| | Olsen, Hans G. | 22 | 8A | 201 | O425
| | Olsen, Hans | 94 | 3B | 201 | O425
| | Olsen, Harold | 76 | 10B | 198 | O425
| | Olsen, Huston | 65 | 6B | 207 | O425
| | Olsen, Hyrum G. | 19 | 4A | 215 | O425
| | Olsen, Inger | 1 | 8A | 209 | O425
| | Olsen, Isaac | 73 | 10B | 198 | O425
| | Olsen, J. Angus | 71 | 1B | 207 | O425
| | Olsen, Jacob B. | 26 | 12A | 209 | O425
| | Olsen, Jennie | 99 | 3B | 201 | O425
| | Olsen, Jennie | 58 | 6B | 234 | O425
| | Olsen, John A. | 94 | 6B | 214 | O425
| | Olsen, Joseph M. | 77 | 2B | 201 | O425
| | Olsen, Joseph | 68 | 3B | 234 | O425
| | Olsen, Lars L. | 70 | 9B | 206 | O425
| | Olsen, Leland | 56 | 4B | 202 | O425
| | Olsen, Leo | 54 | 6B | 201 | O425
| | Olsen, Lewis | 53 | 4B | 202 | O425
| | Olsen, Moroni | 43 | 4A | 202 | O425
| | Olsen, O. E. | 51 | 5B | 207 | O425
| | Olsen, Ola E. Jr. | 21 | 5A | 205 | O425
| | Olsen, Ole C. | 68 | 5B | 201 | O425
| | Olsen, Ole H. | 10 | 4A | 215 | O425
| | Olsen, Ole P. | 90 | 5B | 188 | O425
| | Olsen, Ole | 21 | 11A | 196 | O425
| | Olsen, Olie H. | 68 | 11B | 198 | O425
| | Olsen, Orissa | 69 | 5B | 201 | O425
| | Olsen, Otto | 67 | 8B | 213 | O425
| | Olsen, Roy A. | 25 | 4A | 202 | O425
| | Olsen, Sophia | 40 | 10A | 212 | O425
| | Olsen, Stena | 25 | 3A | 213 | O425
| | Olsen, Thurza | 63 | 3B | 186 | O425
| | Olsen, Vaughn | 77 | 2B | 224 | O425
| | Olsen, Wilbert | 100 | 7B | 201 | O425
| | Olsen, William J. | 80 | 7B | 213 | O425
| | Olsen, William P. | 60 | 8B | 207 | O425
| | Olson, Albert J. | 1 | 11A | 203 | O425
| | Olson, Alexander | 40 | 7A | 215 | O425
| | Olson, Alma J. | 36 | 12A | 206 | O425
| | Olson, Andrew | 63 | 2B | 215 | O425
| | Olson, Annie | 50 | 6A | 234 | O425
| | Olson, Carl Oscar | 52 | 6B | 203 | O425
| | Olson, Carl | 14 | 14A | 195 | O425
| | Olson, Caroline | 42 | 4A | 234 | O425
| | Olson, Charles J. | 11 | 10A | 203 | O425
| | Olson, Clara | 43 | 6A | 203 | O425
| | Olson, Drofna | 39 | 7A | 215 | O425
| | Olson, Ernest W. | 6 | 12A | 203 | O425
| | Olson, Francis M. | 53 | 11B | 209 | O425
| | Olson, Fred | 25 | 16A | 209 | O425
| | Olson, Gudney | 49 | 3A | 198 | O425
| | Olson, H. S. | 15 | 7A | 210 | O425
| | Olson, Hannah | 30 | 12A | 206 | O425
| | Olson, John H. | 30 | 3A | 209 | O425
| | Olson, Jos. L. | 94 | 6B | 215 | O425
| | Olson, Lewis H. | 55 | 3B | 196 | O425
| | Olson, Marsellus | 41 | 7A | 215 | O425
| | Olson, Neils | 18 | 2A | 234 | O425
| | Olson, O. G. | 86 | 3B | 209 | O425
| | Olson, Oley | 22 | 7A | 215 | O425
| | Olson, Olof G. | 49 | 5A | 215 | O425
| | Olson, Olof H. | 59 | 10B | 215 | O425
| | Olson, Parley A. | 60 | 4B | 196 | O425
| | Olson, Sylvia | 38 | 7A | 215 | O425
| | Olson, William F. | 4 | 6A | 206 | O425
| | Olson, Wm. A. | 73 | 4B | 196 | O425
| | Olson, York J. V. | 20 | 8A | 215 | O425
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