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| Surname | Given Name (Maiden Surname) | Page Number(s) |
| Oakes | Alice | 45 |
| Oakes | Henry | 34 |
| Oakes | Julia (Hebb) | 34 |
| Oakes | Rosa M. (Walker) | 34 |
| Oakes | William Henry | 34 |
| Obermueller | Carl | 41 |
| Obermueller | James Edward | 41 |
| Obermueller | Mildred (Wink) | 41 |
| Obermueller | Susan Jane (Schneider) | 41 |
| O'Brien | Elvira Myal | 13 |
| O'Brien | Genevieve (Varney) | 27 |
| O'Brien | George W. | 13 |
| O'Brien | James | 43 |
| O'Brien | John D. | 27 |
| O'Brien | Laura | 13 |
| Odell | Lou | 26 |
| Odenbreit | Elizabeth M. | 38 |
| Odenbreit | Ellen (Punt) | 38 |
| Odenbreit | Geo. | 38 |
| Odenwald | Lilian (Kenyon) | 30 |
| Odenwald | William E. | 30 |
| O'Donnell | Evelyn | 40 |
| Officer | Cornelia Bell | 15 |
| Officer | 4 | |
| Ogden | Abba Jane (Lafluer) | 31 |
| Ogden | John B. | 29 |
| Ogden | Millie A. (Rogen) | 29 |
| Ogden | Solmon Leslie | 31 |
| Ogren | John William | 32 |
| Ogren | Mabel Catherine (Cross) | 32 |
| O'Hara | Mable (Butterick) | 31 |
| O'Hara | Walter | 31 |
| Ohlson | Hilda | 27 |
| Oland | Elsa Julia Helena (Lofgren) | 35 |
| Oland | Emil | 35 |
| Oland | Henning Ekstrom | 35 |
| Oland | Inga (Ekstrom) | 35 |
| Oldham | Anna | 37 |
| Olds | Elizabeth | 1 |
| Oligny | Nancy R. | 21 |
| Oliver | Esther M. (Bjugstad) | 39 |
| Oliver | Mary (Pye) | 9 |
| Olmsted | Jeanette | 37 |
| Olsen | Erna Litchfield (Skerry) | 2, 7, 19 |
| Olsen | Leslie Skerry | IX, 2, 6, 7, 8, 9, 19, 39 |
| Olsen | Margaret Ann Skerry | 19 |
| Olsen | 3 | |
| Olson | August | 25 |
| Olson | Charles Lake | 17 |
| Olson | Christ | 30 |
| Olson | Clara Osena | 36 |
| Olson | Eric | VI |
| Olson | Ferdinand | 36 |
| Olson | Henrietta | 36 |
| Olson | Ida | 39 |
| Olson | Iva | 30 |
| Olson | Kristene | 9 |
| Olson | Louise (Horstad) | 30 |
| Olson | Lulu | 37 |
| Olson | Martha (Lake) | 17 |
| Olson | Norman | 10 |
| Olson | Norman M. | VI |
| Olson | Oscar Arthur | 17 |
| Olson | Phillip | VI |
| Olson | Phyllis | 5, 10 |
| Olund | Adelaide Harner Elaine | 13 |
| Olund | Elsa Julia Helena (Lofgren) | 33 |
| Olund | Emil | 13 |
| Olund | Gustaf Eric | 13 |
| Olund | Henning Ekstrom | 13, 33 |
| Olund | Inga Ekstrom | 13 |
| Olund | Ingeborg Emilie Humpry | 13 |
| Olund | Rolf Emil | 13 |
| O'Neil | Anna | 38 |
| Onnen | Clara (Zimmerman) | 46 |
| Ophim | Bertha | 28 |
| Orde | Charlotte J. | 36 |
| Orde | Delisle | 36 |
| Orde | George F. | 36 |
| Orde | Gertrude Ivey (Cederstrom) | 36 |
| Orme | Harry | 2 |
| Orme | Henry H. | 11 |
| Orme | James E. | 11 |
| Orth | Catherine | 35 |
| Orth | Jonathan Alpheus | 28 |
| Orth | Mamie Anna (Loepper) | 28 |
| Ortman | Emma | 31 |
| Osgood | Mae | 30 |
| Oslie | J. J. | 38 |
| Oslie | Lois V. | 38 |
| Oslie | Maud (Pratt) | 38 |
| Ostol | Anna | 40 |
| Ostran | Bertha | 25 |
| Otis | Charles | 23 |
| Otis | Lois (Austin) | 23 |
| Otis | Pearl | 47 |
| Overholt | Laurie | 21 |
