Railroad Archives Online
| Places term | Scope note | Archival description count | Authority record count |
|---|---|---|---|
| Oroville (Caliif.) | 7 | 0 | |
| Oroville (Wash.) | 262 | 0 | |
| Orr (N.D.) | 44 | 0 | |
| Orth (Minn.) | 0 | 0 | |
| Orting (Wash.) | 4 | 0 | |
| Ortley (S.D.) | 0 | 0 | |
| Ortonville (Iowa) | 0 | 0 | |
| Ortonville (Minn.) | 0 | 0 | |
| Orville (Or.) | 30 | 0 | |
| Orwell Mine (Minn.) | 1 | 0 |