L
| Lakeside | Libby |
| Lambert | Lima |
| Lame Deer | Lincoln |
| Laredo | Livingston |
| Laurel | Lolo |
| Lavina | Loma |
| Leadboro | Lump City |
| Lewistown |
| Montana Historical Society Research Center |
| 225 North Roberts, P.O. Box 201201, Helena, MT 59620-1201, 406-444-2681, 406-444-2696 (fax). |
| mhslibrary@mt.gov |