R
- Radec
- Radnor
- Raffetto
- Ragtown
- Railroad Flat
- Rainbow
- Rainbow Wells
- Raisin City
- Ramada
- Ramirez
- Ramona
- Ramona Bowl
- Ramsey
- Ramsey
- Ramsey Crossing
- Ranch House Estates
- Ranchita
- Rancho Calaveras
- Rancho Carlsbad Trailer Park
- Rancho Cordova
- Rancho Cucamonga
- Rancho del Rey
- Rancho del Sol
- Rancho Dos Palmas
- Rancho Llano Seco
- Rancho Mirage
- Rancho Murieta
- Rancho Palos Verdes
- Rancho Penasquitos
- Rancho Poquitos
- Rancho Rinconada
- Rancho San Diego
- Rancho Santa Fe
- Rancho Santa Margarita
- Ranchos del Oro
- Rancho Seco
- Rancho Tierra Grande
- Rancho Trabuco
- Rancho Vista
- Randall
- Randsburg
- Ravendale
- Ravenna
- Rawhide
- Rawson
- Raymond
- Rector
- Red Apple
- Red Bank
- Redbanks
- Red Bluff
- Redcrest
- Redding
- Red Fir
- Redlands
- Redman
- Red Mountain
- Redondo Beach
- Red Top
- Redway
- Redwood City
- Redwood Corral
- Redwood Estates
- Redwood Grove
- Redwood Lodge
- Redwood Lodge
- Redwoods
- Redwood Terrace
- Redwood Valley
- Reedley
- Reefer City
- Reef Station
- Reeves Place
- Regina Heights
- Reilly Heights
- Relief
- Remnoy
- Reno Junction
- Renoville
- Represa
- Requa
- Rescue
- Reseda
- Reward
- Reward
- Rex
- Rheem Valley
- Rialto
- Ribbonwood
- Ribier
- Ricardo
- Riccas Corner
- Rice
- Rice Fork Summer Homes
- Riceton
- Rich
- Richardson Springs
- Rich Bar
- Richfield
- Richgrove
- Rich Gulch
- Richmond
- Richmond District
- Richvale
- Rico
- Ridge
- Ridgecrest
- Ridgecrest Estates
- Ridgemark
- Rimforest
- Rimlon
- Rimrock
- Rinckel
- Rincon
- Rincon
- Rio Bravo
- Rio Dell
- Rio del Mar
- Rio Linda
- Rio Nido
- Rio Oso
- Rio Vista
- Rio Vista Junction
- Ripley
- Ripon
- Ripperdan
- Riverbank
- Riverbend
- Riverdale
- Riverdale Park
- River Kern
- River Oaks
- River Pines
- River Road Estates
- Riverside
- Riverside Grove
- Riverside Park
- Riverton
- Riverview
- Riverview Farms
- Riviera Estates
- Riz
- Roads End
- Robbers Creek
- Robbins
- Robinson Mills
- Robinson Ranch
- Robinsons Corner
- Robla
- Roblar
- Roble
- Rob Roy Junction
- Rochester
- Rockaway Beach
- Rock Creek
- Rockerby
- Rock Haven
- Rocking K
- Rockland
- Rocklin
- Rockport
- Rocktram
- Rockville
- Rockwood
- Rodeo
- Rodgers Crossing
- Rodgers Flat
- Rogerville
- Rohnert Park
- Rohnerville
- Rolinda
- Rolling Hills
- Rolling Hills Estates
- Rollingwood
- Romoland
- Roosevelt
- Rosamond
- Rosedale
- Roseland
- Rosemary
- Rosemead
- Rosemont
- Rose Place
- Roseville
- Rosewood
- Ross
- Ross Corner
- Rossmoor
- Rotavele
- Rough and Ready
- Round Mountain
- Round Valley
- Rovana
- Rowland Heights
- Rubidoux
- Rucker
- Rumsey
- Running Springs
- Russell City
- Russ Place
- Ruth
- Rutherford
- Ruthven
- Ryan
- Ryde