| Name | Line | Page | District | Soundex
| Olcott, Robert A. | 36 | 6A | 115 | O423
| | Oldride, Isac | 39 | 5A | 111 | O436
| | Oldride, Mary T. | 65 | 5B | 111 | O436
| | Oldroyd, Albert | 74 | 7B | 111 | O436
| | Oldroyd, Andrus | 75 | 5B | 111 | O436
| | Oldroyd, Arnol A. | 47 | 7A | 111 | O436
| | Oldroyd, Isaac W. | 10 | 9A | 111 | O436
| | Oldroyd, Isac R. | 36 | 5A | 111 | O436
| | Oldroyd, John D. | 97 | 5B | 111 | O436
| | Oldroyd, Lamar | 13 | 11A | 111 | O436
| | Oldroyd, Nellie W. | 77 | 7B | 111 | O436
| | Oldroyd, Peter M. | 40 | 7A | 111 | O436
| | Oldroyd, Ruby | 38 | 5A | 111 | O436
| | Olsen, Boyd | 45 | 2A | 117 | O425
| | Olsen, Carl | 97 | 8B | 119 | O425
| | Olsen, Casten | 70 | 11B | 118 | O425
| | Olsen, Dora | 9 | 4A | 119 | O425
| | Olsen, Ellen | 67 | 9B | 116 | O425
| | Olsen, Ervin | 92 | 17B | 116 | O425
| | Olsen, Frands | 83 | 10B | 114 | O425
| | Olsen, George T. | 42 | 1A | 119 | O425
| | Olsen, Georgeia | 68 | 9B | 116 | O425
| | Olsen, Grace | 46 | 2A | 117 | O425
| | Olsen, Johana M. | 42 | 3A | 113 | O425
| | Olsen, Joseph W. | 76 | 8B | 116 | O425
| | Olsen, Joseph | 100 | 10B | 116 | O425
| | Olsen, Le Grand | 44 | 2A | 117 | O425
| | Olsen, Mary N. | 23 | 5A | 118 | O425
| | Olsen, Mary | 43 | 2A | 117 | O425
| | Olsen, Muriel | 65 | 4B | 116 | O425
| | Olsen, Nephi B. | 22 | 4A | 116 | O425
| | Olsen, Niels C. | 1 | 10A | 112 | O425
| | Olsen, Oley | 24 | 4A | 116 | O425
| | Olsen, Oluf | 45 | 17A | 116 | O425
| | Olsen, Owen B. | 73 | 10B | 116 | O425
| | Olsen, Peter E. | 17 | 2A | 113 | O425
| | Olsen, Teter F. | 72 | 3B | 113 | O425
| | Olson, John | 42 | 2A | 120 | O425
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