- Saco
- Saddle Butte
- Saint Ignatius
- Saint Marie
- Saint Pierre
- Saint Regis
- Saint Xavier
- Sand Coulee
- Sangrey
- Santa Rita
- Scobey
- Sedan
- Seeley Lake
- Shawmut
- Shelby
- Shepherd
- Sheridan
- Showdown Ski Area
- Sidney
- Silesia
- Silver Gate
- Simms
- Somers
- South Browning
- South Glastonbury
- South Hills
- Springdale
- Springhill
- Stanford
- Starr School
- Stevensville
- Stockett
- Stryker
- Sula
- Sun Prairie
- Sun River
- Sunburst
- Superior
- Swan Lake
- Sweet Grass
- Sylvanite
