🏠 » Collection
| Surname | Given name | Location | Item |
| O’Neil | John | Massachusetts | Class of 1890 New Bedford, Massachusetts photo album |
| Ogier | Martha Jennie | Ohio | M. Jennie Ogier envelope, ca. 1870, postmarked Cambridge, Guernsey County, Ohio |
| Ogier | Peter | Ohio | M. Jennie Ogier envelope, ca. 1870, postmarked Cambridge, Guernsey County, Ohio |
| Ogier | Samantha | Ohio | M. Jennie Ogier envelope, ca. 1870, postmarked Cambridge, Guernsey County, Ohio |
| Oldham | Eliza Jane | Ohio | M. Jennie Ogier envelope, ca. 1870, postmarked Cambridge, Guernsey County, Ohio |
| Ostrom | Cephas | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Ostrom | Myron | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |

