| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Racimo | city | California | United States | 34.06 | -117.61 | 958 | |
| Rackerby | city | California | United States | 39.44 | -121.34 | 1669 | |
| Raco | city | California | United States | 36.80 | -119.98 | 206 | |
| Radec | city | California | United States | 33.46 | -116.91 | 1788 | |
| Radnor | city | California | United States | 35.83 | -119.26 | 298 | |
| Radum | city | California | United States | 37.67 | -121.86 | 377 | |
| Rafael Village | city | California | United States | 38.07 | -122.55 | 121 | |
| Raffetto | city | California | United States | 38.86 | -120.44 | 5029 | |
| Ragtown | city | California | United States | 34.66 | -116.15 | 2076 | |
| Rail Road Flat | city | California | United States | 38.34 | -120.51 | 2598 | |
| Rail-A-Way Trailer Park | city | California | United States | 33.73 | -117.81 | 82 | |
| Railroad Flat | city | California | United States | 38.34 | -120.51 | 2598 | |
| Rainbow | city | California | United States | 33.41 | -117.15 | 997 | |
| Rainbow | city | California | United States | 39.31 | -120.51 | 6171 | |
| Rainbow Canyon Village | city | California | United States | 33.46 | -117.12 | 1197 | |
| Rainbow Wells | city | California | United States | 35.20 | -115.65 | 4448 | |
| Raines Houses | city | California | United States | 37.42 | -122.16 | 157 | |
| Raisin City | city | California | United States | 36.60 | -119.90 | 196 | |
| Ralph | city | California | United States | 37.97 | -120.27 | 2870 | |
| Ralph Leggett Place | city | California | United States | 39.86 | -123.40 | 1669 | |
| Ralston (historical) | city | California | United States | 39.00 | -120.68 | 3772 | |
| Ramada | city | California | United States | 39.56 | -121.71 | 134 | |
| Ramal | city | California | United States | 38.22 | -122.39 | 6 | |
| Ramirez | city | California | United States | 39.27 | -121.54 | 91 | |
| Ramona | city | California | United States | 33.04 | -116.87 | 1669 | |
| Ramona | city | California | United States | 38.55 | -121.41 | 39 | |
| Ramona Bowl | city | California | United States | 33.72 | -116.95 | 2509 | |
| Ramona Gardens | city | California | United States | 34.06 | -118.19 | 396 | |
| Ramona Park | city | California | United States | 34.07 | -118.12 | 396 | |
| Rampart | city | California | United States | 39.16 | -120.18 | 6709 | |
| Ramsey | city | California | United States | 39.97 | -123.45 | 830 | |
| Ramsey | city | California | United States | 41.28 | -120.51 | 4399 | |
| Ramsey Crossing | city | California | United States | 39.00 | -120.55 | 4189 | |
| Rana | city | California | United States | 34.09 | -117.32 | 1102 | |
| Ranch House Estates | city | California | United States | 38.41 | -120.62 | 2542 | |
| Ranch Mobile Home Park | city | California | United States | 41.69 | -122.63 | 2887 | |
| Ranchero Thunderbird Mobile Home Court | city | California | United States | 37.36 | -122.00 | 98 | |
| Ranchita | city | California | United States | 33.21 | -116.52 | 4189 | |
| Rancho Adolfo Mobile Home Estates | city | California | United States | 34.22 | -119.01 | 170 | |
| Rancho Alipaz Mobile Home Park | city | California | United States | 33.49 | -117.67 | 190 | |
| Rancho Bernardo | city | California | United States | 33.02 | -117.06 | 830 | |
| Rancho Calaveras | city | California | United States | 38.13 | -120.86 | 830 | |
| Rancho Calevero Mobile Home Park | city | California | United States | 33.18 | -117.28 | 390 | |
| Rancho Carlsbad Trailer Park | city | California | United States | 33.15 | -117.29 | 196 | |
| Rancho Casitas Mobile Home Park | city | California | United States | 33.71 | -116.25 | 22 | |
| Rancho Cordova | city | California | United States | 38.59 | -121.30 | 88 | |
| Rancho Cucamonga | city | California | United States | 34.11 | -117.59 | 1174 | |
| Rancho Del Campo | city | California | United States | 32.60 | -116.47 | 2759 | |
| Rancho Dos Palmas | city | California | United States | 33.50 | -115.83 | -1689 | |
| Rancho Escondido Mobile Home Park | city | California | United States | 33.14 | -117.10 | 830 | |
| Rancho Fullerton Mobile Home Estates | city | California | United States | 33.87 | -117.95 | 167 | |
| Rancho Granada Mobile Homes | city | California | United States | 34.39 | -119.50 | 85 | |
| Rancho Huntington Mobile Home Park | city | California | United States | 33.68 | -117.96 | 6 | |
| Rancho La Paz | city | California | United States | 33.86 | -117.91 | 150 | |
| Rancho La Siesta Mobile Home Park | city | California | United States | 33.70 | -117.96 | 6 | |
| Rancho Llano Seco | city | California | United States | 39.61 | -121.95 | 98 | |
| Rancho Loma Rica | city | California | United States | 39.31 | -121.35 | 905 | |
| Rancho Mirage | city | California | United States | 33.74 | -116.41 | 344 | |
| Rancho Murieta | city | California | United States | 38.50 | -121.09 | 177 | |
| Rancho Palos Verdes | city | California | United States | 33.74 | -118.39 | 0 | |
| Rancho Penasquitos | city | California | United States | 32.96 | -117.12 | 830 | |
| Rancho Poquitos | city | California | United States | 37.98 | -120.28 | 2798 | |
| Rancho Ramon Mobile Home Park | city | California | United States | 38.30 | -122.48 | 78 | |
| Rancho Rinconada | city | California | United States | 37.31 | -122.00 | 190 | |
| Rancho San Diego | city | California | United States | 32.75 | -116.94 | 380 | |
| Rancho San Luis Rey Trailer Park | city | California | United States | 33.23 | -117.33 | 147 | |
| Rancho Santa Clarita | city | California | United States | 34.44 | -118.53 | 1669 | |
| Rancho Santa Fe | city | California | United States | 33.02 | -117.20 | 183 | |
| Rancho Santa Margarita | city | California | United States | 33.64 | -117.60 | 990 | |
| Rancho Santa Paul Mobile Home Park | city | California | United States | 34.34 | -119.08 | 344 | |
| Rancho Seco | city | California | United States | 35.28 | -117.99 | 2034 | |
| Rancho Sonora Estates | city | California | United States | 37.99 | -120.40 | 1998 | |
| Rancho Tehama Reserve | city | California | United States | 40.02 | -122.40 | 830 | |
| Rancho Thirty-nine Mobile Home Park | city | California | United States | 33.78 | -117.99 | 45 | |
| Rancho Tierra Grande | city | California | United States | 36.53 | -121.80 | 150 | |
| Rancho Trabuco | city | California | United States | 33.66 | -117.61 | 1017 | |
| Rancho Vista | city | California | United States | 34.62 | -118.22 | 2723 | |
| Rancho Vista Mobile Home Park | city | California | United States | 38.32 | -122.49 | 108 | |
| Rancho Vista Mobile Home Park | city | California | United States | 33.22 | -117.22 | 830 | |
| Rancho Yolo Mobile Home Park | city | California | United States | 38.55 | -121.72 | 39 | |
| Rancho del Arroyo Mobile Home Park | city | California | United States | 35.10 | -120.60 | 39 | |
| Rancho del Avion Capistrano Mobile Home Park | city | California | United States | 33.49 | -117.67 | 196 | |
| Rancho del Rey | city | California | United States | 32.64 | -117.01 | 830 | |
| Rancho del Sol | city | California | United States | 38.72 | -120.65 | 3349 | |
| Rancho del Sol Mobile Home Park | city | California | United States | 33.75 | -117.96 | 16 | |
| Rancho la Mesa Mobile Home Court | city | California | United States | 37.35 | -122.00 | 98 | |
| Rancho las Perris | city | California | United States | 33.81 | -117.21 | 1669 | |
| Ranchos del Oro | city | California | United States | 34.45 | -117.16 | 3349 | |
| Rand | city | California | United States | 35.42 | -117.69 | 2716 | |
| Randall | city | California | United States | 38.34 | -121.54 | 3 | |
| Randolph | city | California | United States | 39.58 | -120.37 | 5029 | |
| Randsburg | city | California | United States | 35.37 | -117.66 | 3776 | |
| Rankin (historical) | city | California | United States | 38.93 | -123.12 | 1669 | |
| Rannells (historical) | city | California | United States | 33.49 | -114.71 | 259 | |
| Rapetti (historical) | city | California | United States | 36.95 | -122.06 | 59 | |
| Rapid River Mobile Home Park | city | California | United States | 40.48 | -122.33 | 403 | |
| Ratto Landing | city | California | United States | 38.23 | -122.29 | 3 | |
| Ravendale | city | California | United States | 40.80 | -120.37 | 5298 | |
| Ravenna | city | California | United States | 34.44 | -118.23 | 2591 | |
| Ravenswood | city | California | United States | 37.48 | -122.14 | 13 | |
| Rawhide | city | California | United States | 37.96 | -120.45 | 1669 | |
| Rawhide | city | California | United States | 39.20 | -120.74 | 3349 | |
| Rawson | city | California | United States | 40.12 | -122.19 | 278 | |
| Raymer | city | California | United States | 34.21 | -118.47 | 830 | |
| Raymond | city | California | United States | 37.22 | -119.91 | 941 | |
| Raymond Hill | city | California | United States | 34.12 | -118.15 | 830 | |
| Rayo | city | California | United States | 36.45 | -119.19 | 377 |