- R Flourney
- Rabbit Island
- Rackerby
- Raco
- Radec
- Radnor
- Radum
- Raffetto
- Ragtown
- Rail Road Flat
- Rainbow
- Rainbow
- Rainbow Wells
- Raisin City
- Ralph
- Ralph Leggett Place
- Ramada
- Ramal
- Ramirez
- Ramona
- Ramona Bowl
- Rampart
- Ramsey
- Ramsey
- Ramsey Crossing
- Ranch House Estates
- Ranch Mobile Home Park
- Rancherie Island
- Ranchita
- Rancho Calaveras