- S San Fran (40 Companies)
- Sacramento (55,861 Companies)
- Saint Helena (1,688 Companies)
- Saint Paul (1 Company)
- Salida (563 Companies)
- Salinas (10,980 Companies)
- Salton City (2 Companies)
- Salyer (6 Companies)
- Samoa (23 Companies)
- San Andreas (637 Companies)
- San Anselmo (1,530 Companies)
- San Ardo (15 Companies)
- San Bernardino (12,926 Companies)
- San Bruno (2,437 Companies)
- San Carlos (4,016 Companies)
- San Clemente (4,630 Companies)
- San Diego (77,843 Companies)
- San Dimas (3,177 Companies)
- San Fernando (2,843 Companies)
- San Francisco (75,880 Companies)
- San Francisco Intnl Airport (1 Company)
- San Gabriel (3,525 Companies)
- San Geronimo (37 Companies)
- San Gregorio (16 Companies)
- San Jacinto (1,507 Companies)
- San Joaquin (90 Companies)
- San Jose (52,155 Companies)
- San Juan Bautista (178 Companies)
- San Juan Capistrano (3,039 Companies)
- San Leandro (7,487 Companies)
- San Lorenzo (781 Companies)
- San Lucas (4 Companies)
- San Luis Obispo (9,744 Companies)
- San Luis Rey (1 Company)
- San Marcos (5,807 Companies)
- San Marino (1,094 Companies)
- San Martin (494 Companies)
- San Mateo (10,798 Companies)
- San Miguel (92 Companies)
- San Pablo (2,095 Companies)
- San Pedro (4,329 Companies)
- San Quentin (6 Companies)
- San Rafael (12,966 Companies)
- San Ramon (5,505 Companies)
- San Simeon (61 Companies)
- San Ysidro (1,289 Companies)
- Sand City (57 Companies)
- Sanger (1,458 Companies)
- Santa Ana (23,663 Companies)
- Santa Barbara (17,297 Companies)
- Santa Clara (11,842 Companies)
- Santa Clarita (2,974 Companies)
- Santa Cruz (8,964 Companies)
- Santa Fe Spgs (30 Companies)
- Santa Fe Springs (7,063 Companies)
- Santa Margarita (111 Companies)
- Santa Maria (10,121 Companies)
- Santa Monica (16,735 Companies)
- Santa Nella (25 Companies)
- Santa Paula (1,910 Companies)
- Santa Rita Park (2 Companies)
- Santa Rosa (21,453 Companies)
- Santa Rosa Valley (5 Companies)
- Santa Ynez (620 Companies)
- Santa Ysabel (33 Companies)
- Santee (2,872 Companies)
- Saratoga (1,357 Companies)
- Sattley (2 Companies)
- Saugus (49 Companies)
- Sausalito (2,448 Companies)
- Scotia (20 Companies)
- Scott Bar (3 Companies)
- Scotts Valley (1,661 Companies)
- Seal Beach (1,684 Companies)
- Seaside (1,893 Companies)
- Sebastopol (2,951 Companies)
- Seeley (4 Companies)
- Seiad Valley (2 Companies)
- Selma (1,358 Companies)
- Sepulveda (5 Companies)
- Sequoia National Park (6 Companies)
- Shadow Hills (4 Companies)
- Shafter (795 Companies)
- Shandon (26 Companies)
- Shasta (10 Companies)
- Shasta Lake (395 Companies)
- Shaver Lake (86 Companies)
- Sheridan (26 Companies)
- Sherman Oaks (8,027 Companies)
- Shingle Springs (3,012 Companies)
- Shingletown (140 Companies)
- Shoshone (7 Companies)
- Sierra City (34 Companies)
- Sierra Madre (623 Companies)
- Sierraville (12 Companies)
- Signal Hill (2,425 Companies)
- Silver Lakes (2 Companies)
- Silverado (62 Companies)
- Simi Valley (9,132 Companies)
- Skyforest (20 Companies)
