S
| Saco | Shelby | Stevensville |
| Saint Ignatius | Sheridan | Sumatra |
| Sand Springs | Sidney | Sun River |
| Savage | Simms | Superior |
| Scobey | Square Butte | Sweetgrass |
| Seeley Lake | Stanford |
| 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 |