| Subject | Page |
| Oak Grove | 11, 12 |
| Oak Grove House | 11 (photo) |
| Oak Grove House Historical Marker | 12 (photo) |
| O'Connell, Jeremiah, Dr., Rev. | 80 |
| Old Post Road | 30 |
| Oliver, George | 17 |
| Order of St. Benedict | 80, 119 |
| Ormand Forge | 44 |
| Ormand, Ben, property of | 15 |
| Osage Mills | 29 |
| Ozark Mill | 52 |
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