S
- Sacramento, the state capital
- Salida
- Salinas
- San Andreas
- San Anselmo
- San Bernardino
- San Bruno
- San Carlos
- San Clemente
- San Diego
- San Dimas
- San Fernando
- San Francisco
- San Gabriel
- San Jacinto
- San Joaquin
- San Jose
- San Juan Bautista
- San Juan Capistrano
- San Leandro
- San Luis Obispo
- San Marcos
- San Marino
- San Martin
- San Mateo
- San Miguel (disambiguation)
- San Pablo
- San Pedro
- San Rafael
- San Ramon
- San Simeon
- San Ysidro
- Sand City
- Sanger
- Santa Ana
- Santa Barbara
- Santa Clara
- Santa Clarita
- Santa Cruz
- Santa Fe Springs
- Santa Maria
- Santa Monica
- Santa Paula
- Santa Rosa
- Santa Ynez
- Santa Ysabel
- Santee
- Saratoga
- Saugus
- Sausalito
- Scotia
- Scotts Valley
- Seal Beach
- Seaside
- Sebastopol
- Selma
- Sepulveda
- Shafter
- Shasta Lake
- Shaver Lake
- Shell Beach
- Sherman Oaks
- Shoshone
- Sierra City
- Sierra Madre
- Sierraville
- Signal Hill
- Silverado
- Simi Valley
- Sky Londa
- Smith River
- Soda Springs (disambiguation)
- Solana Beach
- Soledad
- Solvang
- Sonoma
- Sonora
- South El Monte
- South Gate
- South Laguna
- South Lake Tahoe
- South Pasadena
- South San Francisco
- South San Jose Hills
- South Whittier
- Springville
- Squaw Valley (disambiguation)
- St. Helena
- Stanton
- Stinson Beach
- Stirling City
- Stockton
- Stratford
- Strawberry (disambiguation)
- Strawberry Valley
- Stronghold
- Studio City
- Sugarloaf
- Suisun City
- Sultana
- Summerland
- Sun City
- Sun Valley
- Sunland
- Sunnyvale
- Sunset Beach
- Susanville
- Sutter Creek
- Sylmar
Read more about this topic: List Of Communities In California