- Rancho Calaveras
- Rancho Carlsbad Trailer Park
- Rancho Cordova
- Rancho Cucamonga
- Rancho Mirage
- Rancho Murieta
- Rancho Palos Verdes
- Rancho San Diego
- Rancho Santa Fe
- Rancho Santa Margarita
- Rincon
- Rincon Island
- Randsburg
- Red Bluff
- Redding
- Redlands
- Redondo Beach
- Redway
- Redwood City
- Reedley
- Rialto
- Richgrove
- Ridgecrest
- Ridgemark
- Rio Del Mar
- Rio Dell
- Rio Linda
- Rio Vista
- Ripon
- Riverbank