- San Joaquin Hills
- San Joaquin River Club
- San Joaquin River Estates
- San José
- San Juan Bautista
- San Juan Capistrano
- San Juan Hot Springs
- San Juan Rocks
- San Lawrence Terrace
- San Leandro
- San Lorenzo
- San Lorenzo Park
- San Lucas
- San Luis Island
- San Luis Obispo
- San Luis Rey
- San Luis Rey Heights
- San Marcos
- San Marino
- San Martín
- San Martin Rock
- San Mateo
- San Mateo Rocks
- San Miguel
- San Miguel Island
- San Nicolas Island
- San Onofre
- San Pablo
- San Pasqual
- San Pedro