Barrios de California R
- Racquet Club Estates (28)
- Racquet Club South (7)
- Racquet Club West (14)
- Ramona (20)
- Ramona (3)
- Rampart Village (22)
- Rancho Adjacent (18)
- Rancho Bella Vista (2)
- Rancho Bernardo (70)
- Rancho Fontana (1)
- Rancho Niguel (7)
- Rancho Palos Verdes (69)
- Rancho Park (15)
- Rancho Penasquitos (41)
- Rancho Ramon (3)
- Rancho Rinconada (3)
- Rancho San Diego (7)
- Rancho San Joaquin (1)
- Rancho Santa Teresa (2)
- Rancho-Del Rey (9)
- Ray Park (3)
- Raymond Hill (3)
- Raynor Park (3)
- Redhawk (8)
- Redondo Beach (85)
- Redwood Heights (8)
- Redwood Oaks (1)
- Redwood Shores (13)
- Redwood Village (1)
- Redwood Village-Rolando Park (9)
- Renaissance (3)
- Republic Homes (1)
- Reseda (25)
- Reservoir Hill (2)
- Resthaven Acres (2)
- Rex Manor (1)
- Rexland Acres (2)
- Reyes Adobe (2)
- Rheem Highlands (1)
- Rheem Valley Manor (1)
- Richardson Village (1)
- Richmond Annex (2)
- Richmond District (29)
- Richmond Grove (4)
- Ridgecrest (48)
- Ridgeview-Webster (4)
- Rincon (37)
- Rio Linda (2)
- Rio Lindo (1)
- River District (2)
- River Oaks (4)
- Riverglen (1)
- Riverlakes (2)
- Riverside (1)
- Riverside Airport (4)
- Riverside Rancho (3)
- Riverside Valley Home Gardens (1)
- Riverview (1)
- Riverview (1)
- Riverview (1)
- Riverview Office Park (2)
- Riverview West (5)
- Riverwalk (4)
- Riviera (1)
- Riviera (17)
- Riviera/Westchester (4)
- Robinhood-Bon Vivant (2)
- Robla (4)
- Rockridge (2)
- Roeding Park (11)
- Rohnert Park (29)
- Rolando (13)
- Rolling Hills (3)
- Rolling Hills Ranch (1)
- Roosevelt (1)
- Roosevelt (6)
- Roripaugh Ranch (4)
- Rose Glen (4)
- Rose-Sartorette (2)
- Rosebank (2)
- Rosemead (6)
- Rosemont (15)
- Roseville Heights (1)
- Roseville-Fleet Ridge (17)
- Rosewood Baker (1)
- Rossmoor (1)
- Rossmoyne (13)
- Royal Oaks (1)
- RP Sports Complex (6)
- Rubidoux (8)
- Russian Hill (13)
- Ruth Hardy Park (4)
- Ryan Tract (3)