Railroad Archives Online
| Places term | Scope note | Archival description count | Authority record count |
|---|---|---|---|
| Oatland (N.D.) | 2 | 0 | |
| Oberon (N.D.) | 0 | 0 | |
| O'Brien Mine (Minn.) | 1 | 0 | |
| O'Brien (Minn.) | 12 | 0 | |
| O'Brien (Wash.) | 0 | 0 | |
| O'Briens Quarry (Minn.) | 5 | 0 | |
| O'Brien's Siding (Minn.) | 1 | 0 | |
| O'Brien's (Wash.) | 1 | 0 | |
| Occidental Spur (Wash.) | 0 | 0 | |
| Ocean Park (B.C.) | 15 | 0 |