G
| Galata | Glasgow |
| Gallatin Gateway | Glendale |
| Gardiner | Glendive |
| Garnet | Glentana |
| Gebo | Granite |
| Geraldine | Grantsdale |
| Geyser | Grass Range |
| Gildford | Great Falls |
| Gilman |
| 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 |