Barrios de California R
- Racquet Club Estates (18)
- Racquet Club South (4)
- Racquet Club West (18)
- Ramblewood (3)
- Ramona (26)
- Ramona (7)
- Rampart Village (42)
- Rancho Adjacent (22)
- Rancho Bella Vista (6)
- Rancho Bernardo (58)
- Rancho Cordova North (2)
- Rancho Cucamonga (2)
- Rancho Fontana (2)
- Rancho Niguel (12)
- Rancho Park (21)
- Rancho Penasquitos (34)
- Rancho Ramon (3)
- Rancho Rinconada (3)
- Rancho San Joaquin (3)
- Rancho Santa Teresa (2)
- Rancho West (2)
- Rancho-Del Rey (11)
- Ray Park (3)
- Raymond Hill (1)
- Raynor Park (4)
- Redhawk (16)
- Redwood Estates (1)
- Redwood Heights (13)
- Redwood Oaks (4)
- Redwood Shores (15)
- Redwood Village (1)
- Redwood Village-Rolando Park (9)
- Renaissance (6)
- Republic Homes (2)
- Reservoir Hill (5)
- Rexland Acres (2)
- Reyes Adobe (1)
- Rheem Blvd Area (1)
- Rheem Valley Manor (1)
- Rialto Airport (1)
- Richmond Annex (4)
- Richmond District (29)
- Richmond Grove (9)
- Ridgeview-Webster (2)
- Rincon (40)
- Rio Bravo (2)
- River District (2)
- River Oaks (1)
- River Oaks (4)
- Riverglen (1)
- Riverlakes (10)
- Riverside (1)
- Riverside Airport (7)
- Riverside Rancho (8)
- Riverside Valley Home Gardens (1)
- Riverview (1)
- Riverview (2)
- Riverview Office Park (1)
- Riverview West (2)
- Riverwalk (8)
- Riviera (1)
- Riviera (18)
- Riviera/Westchester (14)
- Robinhood-Bon Vivant (3)
- Robinson Ranch (1)
- Robla (3)
- Rockaway Beach (1)
- Rockridge (8)
- Roeding Park (12)
- Rolando (21)
- Rolling Hills (1)
- Rolling Hills Ranch (2)
- Roosevelt (4)
- Roosevelt (5)
- Roripaugh Ranch (2)
- Rose Garden (1)
- Rose Garden (2)
- Rose Glen (2)
- Rosebank (2)
- Rosemont (18)
- Roseville Heights (2)
- Roseville-Fleet Ridge (15)
- Rosewood Baker (2)
- Rossmoor (1)
- Rossmoyne (13)
- Royal Oaks (1)
- RP Sports Complex (8)
- Rubidoux (9)
- Russian Hill (16)
- Ruth Hardy Park (8)