Railroad Archives Online
| Places term | Scope note | Archival description count | Authority record count |
|---|---|---|---|
| Opal City (Or.) | 105 | 0 | |
| Opheim Line Jct. | 0 | 0 | |
| Opheim (Mont.) | 31 | 0 | |
| Opheim {Mont.) | 1 | 0 | |
| Ophiem (Mont.) | 1 | 0 | |
| Opportunity (Wash.) | 41 | 0 | |
| OR&N Junction (Wash.) | 4 | 0 | |
| Orange (Mont.) | 0 | 0 | |
| Oraville Line Jct. (Wash.) | 0 | 0 | |
| Orchard Ave. (Wash.) | 1 | 0 |