- Sacramento (Population: 407,018)
- Salida (Population: 12,560)
- Salinas (Population: 151,060)
- San Andreas (Population: 2,615)
- San Anselmo (Population: 12,378)
- San Antonio Heights (Population: 3,122)
- San Bernardino (Population: 185,401)
- San Bruno (Population: 40,165)
- San Buenaventura (Ventura) (Population: 100,916)
- San Carlos (Population: 27,718)
- San Clemente (Population: 49,936)
- San Diego (Population: 1,223,400)
- San Diego Country Estates (Population: 9,262)
- San Dimas (Population: 34,980)
- San Fernando (Population: 23,564)
- San Francisco (Population: 776,733)
- San Gabriel (Population: 39,804)
- San Jacinto (Population: 23,779)
- San Joaquin (Population: 3,270)
- San Joaquin Hills (Population: 2,959)
- San Jose (Population: 894,943)
- San Juan Bautista (Population: 1,549)
- San Juan Capistrano (Population: 33,826)
- San Leandro (Population: 79,452)
- San Lorenzo (Population: 21,898)
- San Luis Obispo (Population: 44,174)
- San Marcos (Population: 54,977)
- San Marino (Population: 12,945)
- San Martin (Population: 4,230)
- San Mateo (Population: 92,482)
- San Miguel (Population: 1,427)
- San Pablo (Population: 30,215)
- San Rafael (Population: 56,063)
- San Ramon (Population: 44,722)
- Sanger (Population: 18,931)
- Santa Ana (Population: 337,977)
- Santa Barbara (Population: 92,325)
- Santa Clara (Population: 102,361)
- Santa Clarita (Population: 151,088)
- Santa Cruz (Population: 54,593)
- Santa Fe Springs (Population: 17,438)
- Santa Maria (Population: 77,423)
- Santa Monica (Population: 84,084)
- Santa Paula (Population: 28,598)
- Santa Rosa (Population: 147,595)
- Santa Venetia (Population: 4,298)
- Santa Ynez (Population: 4,584)
- Santee (Population: 52,975)
- Saratoga (Population: 29,843)
- Sausalito (Population: 7,330)
- Scotts Valley (Population: 11,385)
- Seal Beach (Population: 24,157)
- Searles Valley (Population: 1,885)
- Seaside (Population: 31,696)
- Sebastopol (Population: 7,774)
- Sedco Hills (Population: 3,078)
- Seeley (Population: 1,624)
- Selma (Population: 19,444)
- Seven Trees (Population: 1,666)
- Shackelford (Population: 5,170)
- Shafter (Population: 12,736)
- Shasta Lake (Population: 9,008)
- Shingle Springs (Population: 2,643)
- Shingletown (Population: 2,222)
- Sierra Madre (Population: 10,578)
- Signal Hill (Population: 9,333)
- Simi Valley (Population: 111,351)
- Solana Beach (Population: 12,979)
- Soledad (Population: 11,263)
- Solvang (Population: 5,332)
- Sonoma (Population: 9,128)
- Sonora (Population: 4,423)
- Soquel (Population: 5,081)
- Soulsbyville (Population: 1,729)
- South Dos Palos (Population: 1,385)
- South El Monte (Population: 21,144)
- South Gate (Population: 96,375)
- South Lake Tahoe (Population: 23,609)
- South Oroville (Population: 7,695)
- South Pasadena (Population: 24,292)
- South San Francisco (Population: 60,552)
- South San Gabriel (Population: 7,595)
- South San Jose Hills (Population: 20,218)
- South Taft (Population: 1,898)
- South Whittier (Population: 55,193)
- South Woodbridge (Population: 2,825)
- South Yuba City (Population: 12,651)
- Spring Valley (Population: 26,663)
- Springville (Population: 1,109)
- Squaw Valley (Population: 2,691)
- St. Helena (Population: 5,950)
- Stallion Springs (Population: 1,522)
- Stanford (Population: 13,315)
- Stanton (Population: 37,403)
- Stockton (Population: 243,771)
- Stratford (Population: 1,264)
- Strathmore (Population: 2,584)
- Strawberry (Population: 5,302)
- Suisun City (Population: 26,118)
- Summerland (Population: 1,545)
- Sun City (Population: 17,773)
- Sunnyside-Tahoe City (Population: 1,761)
- Sunnyslope (Population: 4,437)
- Sunnyvale (Population: 131,760)
- Sunol (Population: 1,332)
- Susanville (Population: 13,541)
- Sutter (Population: 2,885)
- Sutter Creek (Population: 2,303)
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