- Saddle Ridge
- Saguache
- Saint Anton Highlands
- Saint Marys
- Salida
- Salt Creek
- San Acacio
- San Luis
- Sanford
- Sawpit
- Security-Widefield
- Sedalia
- Sedgwick
- Segundo
- Seibert
- Sequndo
- Seven Hills
- Seven Hills
- Severance
- Shaw Heights
- Sheridan
- Sheridan Lake
- Sherrelwood
- Silt
- Silver Cliff
- Silver Plume
- Silverthorne
- Silverton
- Silverton Mountain
- Simla
- Ski Cooper
- Smeltertown
- Snowmass
- Snowmass Village
- Snyder
- SolVista Golf & Ski Ranch (Silver Creek)
- South Fork
- Southglenn
- Springfield
- Starkville
- Steamboat
- Steamboat Springs
- Sterling
- Stonegate
- Stonewall Gap
- Strasburg
- Stratmoor
- Stratton
- Stratton
- Sugar City
- Sugarloaf
- Sunlight Mountain Resort
- Sunshine
- Superior
- Swink
