- Richgrove
- Richmond
- Richvale
- Ridgecrest
- Rimforest
- Rio Dell
- Rio Linda
- Rio Nido
- Rio Oso
- Rio Vista
- Ripon
- River Pines
- Riverbank
- Riverdale
- Riverside
- Robbins
- Rocklin
- Rodeo
- Rohnert Park
- Rosamond
- Rosemead
- Roseville
- Ross
- Round Mountain
- Rowland Heights
- Rumsey
- Running Springs
- Rutherford
- Ryde
- Sacramento
- Saint Helena
- Salida
- Salinas
- Salton City
- Salyer
- Samoa
- San Andreas
- San Anselmo
- San Ardo
- San Bernardino
- San Bruno
- San Carlos
- San Clemente
- San Diego
- San Dimas
- San Fernando
- San Francisco
- San Gabriel
- San Geronimo
- San Gregorio
- San Jacinto
- San Joaquin
- San Jose
- San Juan Bautista
- San Juan Capistrano
- San Leandro
- San Lorenzo
- San Lucas
- San Luis Obispo
- San Luis Rey
- San Marcos
- San Marino
- San Martin
- San Mateo
- San Miguel
- San Pablo
- San Pedro
- San Quentin
- San Rafael
- San Ramon
- San Simeon
- San Ysidro
- Sanger
- Santa Ana
- Santa Barbara
- Santa Clara
- Santa Clarita
- Santa Cruz
- Santa Fe Springs
- Santa Margarita
- Santa Maria
- Santa Monica
- Santa Paula
- Santa Rita Park
- Santa Rosa
- Santa Ynez
- Santa Ysabel
- Santee
- Saratoga
- Sausalito
- Scotia
- Scott Bar
- Scotts Valley
- Seal Beach
- Seaside
- Sebastopol
- Seeley
- Seiad Valley
- Selma
- Sequoia National Park
- Shafter
- Shandon
- Shasta
- Shasta Lake
- Shaver Lake
- Sheridan
- Sherman Oaks
- Shingle Springs
- Shingletown
- Shoshone
- Sierra City
- Sierra Madre
- Sierraville
- Signal Hill
- Silverado
- Simi Valley
- Skyforest
- Sloughhouse
- Smartsville
- Smith River
- Snelling
- Soda Springs
- Solana Beach
- Soledad
- Solvang
- Somerset
- Somes Bar
- Somis
- Sonoma
- Sonora
- Soquel
- Soulsbyville
- South Dos Palos
- South El Monte
- South Gate
- South Lake Tahoe
- South Pasadena
- South San Francisco
- Spreckels
- Spring Valley
- Springville
- Squaw Valley
- Standard
- Standish
- Stanford
- Stanton
- Stevenson Ranch
- Stevinson
- Stewarts Point
- Stinson Beach