| Name | Date | Misc. Info. | Sex | Birth Place | Residence | Parents | Source |
| O'CONNELL, Ella F. | 9 Jun 1891 | F | Deerfield | Deerfield | Frank & Agnes O'Connell | LCB 3-36 | |
| O'CONNER, Clarence | 1 Sep 1886 | M | Genoa | Genoa | John and Rosanna O'Conner | LCB 2-262 | |
| O'CONNOR, Agnes M. | 19 May 1889 | F | Genoa | Genoa | John & Rosanna O'Connor | LCB 2-332 | |
| O'CONNOR, Lewis | 9 Apr 1881 | M | Genoa | Genoa | John & Rozanna O'Connor | LCB 2-147 | |
| O'CONNOR, Terrance | 13 Sep 1883 | M | Genoa | Genoa | John & Rosanna O'Connor | LCB 2-199 | |
| O'DELL, Arthur | 14 Jul 1887 | M | Genoa | Genoa | Wm. & Mina M. O'Dell | LCB 2-290 | |
| ODELL, Claude | 20 May 1881 | M | Iosco | Iosco | Samuel & Susan Odell | LCB 2-166 | |
| ODELL, Marsha B. | 1 Oct 1882 | F | Genoa | Genoa | William & Matilda Odell | LCB 2-185 | |
| ODELL, Mary E. | 21 Jul 1882 | F | Iosco | Iosco | Leonard & Susan Odell | LCB 2-193 | |
| ODELL, Sleward Wm. | 12 Dec 1884 | M | Genoa | Genoa | William & Matilda Odell | LCB 2-234 | |
| O'DWYER, Francis J. | 25 Dec 1888 | M | Hartland | Hartland | John & Catharine O'Dwyer | LCB 2-309 | |
| OESTERLE, Frank Jos. Edw. | 16 Aug 1890 | M | Conway | Conway | George & Mary Oesterle | LCB 3-14 | |
| OESTERLE, Willie | 9 Nov 1886 | M | Conway | Conway | John and Agness Oesterle | LCB 2-265 | |
| OESTERLY, Charles | 11 Mar 1888 | M | Conway | Conway | George & Mary Osterly | LCB 2-316 | |
| OLDE, Mary | 2 Jun 1886 | F | Green Oak | Green Oak | Robert W. & Harriett Olde | LCB 2-260 | |
| OLESON, Luella | 23 Dec 1883 | F | Cohoctah | Cohoctah | Knud & Elizabeth Oleson | LCB 2-210 | |
| OLIVER, Archie | 4 Oct 1884 | M | Brighton | Brighton | Frank & Celia Oliver | LCB 2-225 | |
| OLIVER, Myrtle O. | 4 Aug 1881 | F | Brighton | Brighton | Frank & Jane Oliver | LCB 2-152 | |
| OLRICH, Ellen J. | 16 Jan 1889 | F | Deerfield | Deerfield | William & Katie Olrich | LCB 2-330 | |
| OLRICH, Lena | 30 Jul 1890 | F | Deerfield | Deerfield | William & Kate Olrich | LCB 3-16 | |
| OLSAVER, Bessie B. | 12 Jun 1890 | F | Green Oak | Green Oak | Harrison Olsaver & Rosina Loomis | LCB 3-19 | |
| OLSAVER, Blanche | 8 Jul 1887 | F | Green Oak | Green Oak | Harrison & Rose Olsaver | LCB 2-297 | |
| OLSAVER, Clayton | 22 Jan 1883 | M | Green Oak | Green Oak | Harrison & Rosanna Olsaver | LCB 2-207 | |
| OLSAVER, John | 5 Apr 1885 | M | Green Oak | Green Oak | Harrison & Rosina Olsaver | LCB 2-255 | |
| OLSAVER, Lena M. | 26 Sep 1883 | F | Green Oak | Green Oak | Curtis S. & Liona B. Olsaver | LCB 2-207 | |
| OLSAVER, Lucretia | 4 Mar 1881 | F | Green Oak | Green Oak | Harrison & Rosana Olsaver | LCB 2-148 | |
| OPELT, Matie F. | 2 Nov 1882 | F | Iosco | Iosco | Frank Opelt & Maggie Senn | LCB 2-193 | |
| OSBON, Carl C. | 17 May 1884 | M | Cohoctah | Cohoctah | Peter & Mary Osbon | LCB 2-229 | |
| OSBORN, Ansley | 16 Apr 1887 | M | Brighton | Brighton | John & Ila Osborn | LCB 2-287 | |
| OSBORN, John | 10 Apr 1888 | M | Brighton | Brighton | Geo. M. & Hannah Osborn | LCB 2-311 | |
| OSBORNE, Arthur P. | 18 Oct 1882 | M | Handy | Handy | Frank B. & Elizabeth Osborne | LCB 2-181 | |
| OSBORNE, William | 6 May 1884 | M | Brighton | Brighton | Geo. & Hannah Osborne | LCB 2-226 | |
| OSTRANDER, Bertha E. C. | 11 Mar 1880 | F | Cohoctah | Cohoctah | Waterbury & Harriet Ostrander | LCB 2-124 | |
| OSTRANDER, Sylvester | 28 Mar 1882 | M | Cohoctah | Cohoctah | Waterbury & Harriet Ostrander | LCB 2-173 | |
| OSTROM, Josie M. | 2 Jul 1886 | F | Conway | Conway | John R. and Caroline Ostrom | LCB 2-264 | |
| OWEN, John | 17 Sep 1883 | M | Oceola | Oceola | John F. & Elizabeth Owen | LCB 2-204 | |
| OXLEY, Geo. A. | 29 Jul 1886 | M | Howell Village | Howell | Alfred W. and Eliza Oxley | LCB 2-274 |