Montana Cities
- Saco, MT
- Saddle Butte, MT
- Sage Creek Colony, MT
- Saint Ignatius, MT
- Saint Johns, MT
- Saint Marie, MT
- Saint Mary, MT
- Saint Regis, MT
- Saint Xavier, MT
- Salem, MT
- Salmon Prairie, MT
- Saltese, MT
- Sand Coulee, MT
- Sand Springs, MT
- Sanders, MT
- Sangrey, MT
- Santa Rita, MT
- Sapphire Village, MT
- Sappington, MT
- Saugus, MT
- Savage, MT
- Savoy, MT
- Sayle, MT
- Saypo, MT
- Schilling, MT
- Schley, MT
- Scholtztown, MT
- Scobey, MT
- Sedan, MT
- Seeley Lake, MT
- Selmes, MT
- Seville Colony, MT
- Shambo Springs, MT
- Shawmut, MT
- Shaws, MT
- Sheffels, MT
- Sheffield, MT
- Shelby, MT
- Shepherd, MT
- Sheridan, MT
- Sherryl, MT
- Shields, MT
- Shirley, MT
- Shonkin, MT
- Sidney, MT
- Sieben, MT
- Silesia, MT
- Silver Bow, MT
- Silver Bow Park, MT
- Silver City, MT
- Silver Gate, MT
- Silver Star, MT
- Simms, MT
- Simpson, MT
- Singleshot, MT
- Sioux Pass, MT
- Sipple, MT
- Sixteen, MT
- Siyeh Bend, MT
- Skones, MT
- Skyline, MT
- Sleeping Buffalo, MT
- Sloan, MT
- Snider, MT
- Snowden, MT
- Snowslip, MT
- Soda Springs, MT
- Sodak Mill, MT
- Sohon, MT
- Somers, MT
- Sonnette, MT
- Soudan, MT
- Sourdough, MT
- South Browning, MT
- South Glastonbury, MT
- South Hills, MT
- Spear, MT
- Sperry Chalets, MT
- Sphinx, MT
- Spion Kop, MT
- Spokane Creek, MT
- Spring Creek Colony, MT
- Spring Gulch, MT
- Springdale, MT
- Springdale Colony, MT
- Springhill, MT
- Springtime, MT
- Springtown, MT
- Springwater Colony, MT
- Sprole, MT
- Spurling, MT
- Square Butte, MT
- St. Ignatius, MT
- St. Marie, MT
- St. Pierre, MT
- St. Regis, MT
- St. Xavier, MT
- Stacey, MT
- Stanford, MT
- Stark, MT
- Starr School, MT
- Staton, MT
- Sterling, MT
- Steve Forks, MT
- Stevensville, MT
- Stipek, MT
- Stockett, MT
- Stone, MT
- Story, MT
- Stranahan, MT
- Straw, MT
- Stryker, MT
- Stuart, MT
- Stump Town, MT
- Suffolk, MT
- Sula, MT
- Sumatra, MT
- Summit, MT
- Summit Valley, MT
- Sumner, MT
- Sun Prairie, MT
- Sun River, MT
- Sunburst, MT
- Sundance, MT
- Sunlight, MT
- Sunnybrook Colony, MT
- Sunnyside, MT
- Sunset, MT
- Superior, MT
- Surprise Creek Colony, MT
- Swan Lake, MT
- Sweet Grass, MT
- Swiftcurrent, MT
- Sylvanite, MT
