Barrios de California R
- Racquet Club Estates
- Racquet Club West
- Ramona
- Ramona
- Rampart Village
- Rancho Adjacent
- Rancho Bella Vista
- Rancho Bernardo
- Rancho Niguel
- Rancho Park
- Rancho Penasquitos
- Rancho Rinconada
- Rancho San Joaquin
- Rancho Santa Teresa
- Rancho-Del Rey
- Ray Park
- Raymond Hill
- Raynor Park
- Redwood Heights
- Redwood Oaks
- Redwood Shores
- Redwood Village
- Redwood Village-Rolando Park
- Renaissance
- Reservoir Hill
- Rexland Acres
- Richmond Annex
- Richmond District
- Richmond Grove
- Ridgeview-Webster
- Rincon
- River District
- River Oaks
- Riverglen
- Riverlakes
- Riverpoint
- Riverside
- Riverside Airport
- Riverside Rancho
- Riverview
- Riverview
- Riverview Office Park
- Riverview West
- Riverwalk
- Riviera
- Riviera/Westchester
- Robla
- Rockridge
- Roeding Park
- Rolando
- Roosevelt
- Roosevelt
- Rose Glen
- Rosebank
- Rosemont
- Roseville Heights
- Roseville-Fleet Ridge
- Rosewood Baker
- Rossmoyne
- Royal Oaks
- RP Sports Complex
- Rubidoux
- Russian Hill