Barrios de California R
- Racquet Club Estates (22)
- Racquet Club South (4)
- Racquet Club West (19)
- Rafael Meadows-Los Ranchitos (1)
- Ramona (12)
- Ramona (15)
- Rampart Village (29)
- Rancho Adjacent (27)
- Rancho Bella Vista (5)
- Rancho Bernardo (86)
- Rancho Cordova North (1)
- Rancho Cucamonga (2)
- Rancho Fontana (4)
- Rancho Niguel (9)
- Rancho Park (27)
- Rancho Penasquitos (50)
- Rancho Ramon (1)
- Rancho Rinconada (8)
- Rancho San Joaquin (6)
- Rancho San Rafael (1)
- Rancho Santa Teresa (4)
- Rancho West (3)
- Rancho-Del Rey (14)
- Ray Park (2)
- Raymond Hill (2)
- Raynor Park (6)
- Redhawk (10)
- Redwood Estates (1)
- Redwood Heights (13)
- Redwood Oaks (4)
- Redwood Shores (19)
- Redwood Village (1)
- Redwood Village-Rolando Park (14)
- Renaissance (4)
- Reservoir Hill (3)
- Resthaven Acres (1)
- Rex Manor (1)
- Rexland Acres (3)
- Reyes Adobe (1)
- Rheem Blvd Area (2)
- Rheem Valley Manor (1)
- Richland Farms (1)
- Richmond American Homes (1)
- Richmond Annex (6)
- Richmond District (26)
- Richmond Grove (9)
- Richmond Ranch (1)
- Ridgeview-Webster (4)
- Rimer Area (2)
- Rincon (28)
- Rio Bravo (3)
- River District (2)
- River Oaks (4)
- Riverglen (1)
- Riverlakes (7)
- Riverside (1)
- Riverside Airport (8)
- Riverside Rancho (9)
- Riverside Valley Home Gardens (2)
- Riverview (1)
- Riverview (5)
- Riverview Office Park (1)
- Riverview West (11)
- Riverwalk (6)
- Riviera (18)
- Riviera (2)
- Riviera/Westchester (10)
- Robinhood-Bon Vivant (2)
- Robla (5)
- Rockridge (5)
- Rockspring (1)
- Roeding Park (12)
- Rogers (1)
- Rolando (22)
- Rolling Hills (3)
- Rolling Hills Ranch (1)
- Roosevelt (4)
- Roosevelt (9)
- Roripaugh Ranch (1)
- Rose Garden (2)
- Rose Glen (3)
- Rose-Sartorette (1)
- Rosebank (1)
- Rosemont (22)
- Roseville Heights (1)
- Roseville-Fleet Ridge (14)
- Rosewood Baker (2)
- Rossmoor (1)
- Rossmoyne (23)
- Rousch (1)
- Royal Oaks (1)
- RP Sports Complex (12)
- Rubidoux (19)
- Rudgear Estates (1)
- Russian Hill (11)
- Ruth Hardy Park (7)