- Ramona (Population: 15,691)
- Rancho Calaveras (Population: 4,182)
- Rancho Cordova (Population: 55,060)
- Rancho Cucamonga (Population: 127,743)
- Rancho Mirage (Population: 13,249)
- Rancho Murieta (Population: 4,193)
- Rancho Palos Verdes (Population: 41,145)
- Rancho San Diego (Population: 20,155)
- Rancho Santa Fe (Population: 3,252)
- Rancho Santa Margarita (Population: 47,214)
- Rancho Tehama Reserve (Population: 1,406)
- Red Bluff (Population: 13,147)
- Redding (Population: 80,865)
- Redlands (Population: 63,591)
- Redondo Beach (Population: 63,261)
- Redway (Population: 1,188)
- Redwood City (Population: 75,402)
- Reedley (Population: 20,756)
- Rialto (Population: 91,873)
- Richgrove (Population: 2,723)
- Richmond (Population: 99,216)
- Ridgecrest (Population: 24,927)
- Ridgemark (Population: 2,741)
- Rio del Mar (Population: 9,198)
- Rio Dell (Population: 3,174)
- Rio Linda (Population: 10,466)
- Rio Vista (Population: 4,571)
- Ripon (Population: 10,146)
- Riverbank (Population: 15,826)
- Riverdale (Population: 2,416)
- Riverdale Park (Population: 1,094)
- Riverside (Population: 255,166)
- Rocklin (Population: 36,330)
- Rodeo (Population: 8,717)
- Rohnert Park (Population: 42,236)
- Rolling Hills (Population: 1,871)
- Rolling Hills Estates (Population: 7,676)
- Rollingwood (Population: 2,900)
- Romoland (Population: 2,764)
- Rosamond (Population: 14,349)
- Rosedale (Population: 8,445)
- Roseland (Population: 6,369)
- Rosemead (Population: 53,505)
- Rosemont (Population: 22,904)
- Roseville (Population: 79,921)
- Ross (Population: 2,329)
- Rossmoor (Population: 10,298)
- Rowland Heights (Population: 48,553)
- Rubidoux (Population: 29,180)
- Running Springs (Population: 5,125)
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