Railroad Archives Online
| Places term | Scope note | Archival description count | Authority record count |
|---|---|---|---|
| Olson (B.C.) | 6 | 0 | |
| Olney (Mont.) | 64 | 0 | |
| Olmstead (N.D.) | 8 | 0 | |
| Ollie (Mont.) | 0 | 0 | |
| Olivia (Minn.) | 0 | 0 | |
| Oliver (Wis.) | 0 | 0 | |
| Oliver Mine (Minn.) | 2 | 0 | |
| Oliver (B.C.) | 1 | 0 | |
| Olin (Iowa) | 0 | 0 | |
| Olequa (Wash.) | 8 | 0 |