W
| Walkerville | Wickes |
| West Yellowstone | Wilsall |
| Westby | Winifred |
| Wheeler | Winnett |
| White Sulpher Springs | Winston |
| Whitefish | Wisdom |
| Whitehall | Wolf Point |
| Wibaux | Worden |
| 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 |