| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Rialto | city | California | United States | 34.11 | -117.37 | 1246 | |
| Ribbonwood | city | California | United States | 33.57 | -116.50 | 5029 | |
| Ribier | city | California | United States | 35.25 | -118.88 | 830 | |
| Ricardo | city | California | United States | 35.37 | -117.99 | 2595 | |
| Riccas Corner | city | California | United States | 38.42 | -122.79 | 85 | |
| Rice | city | California | United States | 34.08 | -114.85 | 908 | |
| Rice Fork Summer Homes | city | California | United States | 39.40 | -122.95 | 1860 | |
| Rices Junction | city | California | United States | 37.15 | -122.13 | 830 | |
| Riceton | city | California | United States | 39.45 | -121.73 | 95 | |
| Rich | city | California | United States | 34.98 | -117.73 | 2509 | |
| Rich Gulch | city | California | United States | 38.33 | -120.63 | 1988 | |
| Richardson Springs | city | California | United States | 39.84 | -121.78 | 830 | |
| Richfield | city | California | United States | 39.97 | -122.18 | 259 | |
| Richfields | city | California | United States | 33.87 | -117.83 | 308 | |
| Richgrove | city | California | United States | 35.80 | -119.11 | 830 | |
| Richland | city | California | United States | 33.15 | -117.14 | 830 | |
| Richland (historical) | city | California | United States | 39.40 | -121.65 | 98 | |
| Richmond | city | California | United States | 37.94 | -122.35 | 59 | |
| Richmond District | city | California | United States | 37.78 | -122.47 | 196 | |
| Richmond View | city | California | United States | 37.94 | -122.31 | 318 | |
| Richvale | city | California | United States | 39.49 | -121.74 | 101 | |
| Rico | city | California | United States | 32.81 | -115.40 | -1689 | |
| Ridge | city | California | United States | 39.34 | -123.30 | 1998 | |
| Ridge View | city | California | United States | 39.23 | -121.08 | 2529 | |
| Ridgecrest | city | California | United States | 35.62 | -117.67 | 2509 | |
| Ridgecrest Estates | city | California | United States | 33.40 | -117.21 | 862 | |
| Ridgemark | city | California | United States | 36.81 | -121.37 | 830 | |
| Ridgeview Village | city | California | United States | 38.67 | -121.08 | 830 | |
| Ridgeville | city | California | United States | 40.86 | -122.80 | 2509 | |
| Ridgewood | city | California | United States | 39.22 | -120.09 | 6227 | |
| Ridgewood Park | city | California | United States | 39.33 | -123.34 | 1998 | |
| Ridgewoods Heights | city | California | United States | 40.74 | -124.15 | 396 | |
| Riego | city | California | United States | 38.75 | -121.48 | 39 | |
| Rimforest | city | California | United States | 34.23 | -117.23 | 5869 | |
| Rimlon | city | California | United States | 33.84 | -116.44 | 324 | |
| Rimrock | city | California | United States | 34.20 | -116.55 | 4520 | |
| Rinckel | city | California | United States | 41.13 | -122.08 | 2700 | |
| Rincon | city | California | United States | 33.29 | -116.96 | 1092 | |
| Rincon | city | California | United States | 37.01 | -122.05 | 344 | |
| Rincon | city | California | United States | 34.37 | -119.48 | 0 | |
| Rinconada | city | California | United States | 37.23 | -121.97 | 830 | |
| Rio Bravo | city | California | United States | 35.40 | -119.29 | 318 | |
| Rio Del Mar | city | California | United States | 36.97 | -121.90 | 0 | |
| Rio Dell | city | California | United States | 40.50 | -124.11 | 196 | |
| Rio Dell | city | California | United States | 38.50 | -122.91 | 196 | |
| Rio Hondo | city | California | United States | 33.98 | -118.12 | 124 | |
| Rio Linda | city | California | United States | 38.69 | -121.45 | 39 | |
| Rio Nido | city | California | United States | 38.52 | -122.98 | 173 | |
| Rio Oso | city | California | United States | 38.96 | -121.54 | 36 | |
| Rio Plaza Mobile Home Park | city | California | United States | 36.20 | -121.13 | 285 | |
| Rio Vista | city | California | United States | 38.16 | -121.69 | 3 | |
| Rio Vista Junction | city | California | United States | 38.21 | -121.88 | 98 | |
| Rio Vista Mobile Home Estates | city | California | United States | 33.84 | -117.87 | 229 | |
| Ripley | city | California | United States | 33.53 | -114.66 | 255 | |
| Ripon | city | California | United States | 37.74 | -121.12 | 65 | |
| Ripperdan | city | California | United States | 36.85 | -120.06 | 242 | |
| River Garden (historical) | city | California | United States | 39.85 | -123.42 | 1223 | |
| River Oaks | city | California | United States | 36.90 | -121.59 | 830 | |
| River Park Mobile Estates | city | California | United States | 40.47 | -122.28 | 400 | |
| River Pines | city | California | United States | 38.55 | -120.74 | 1998 | |
| River Road Estates | city | California | United States | 37.00 | -119.99 | 367 | |
| Riverbank | city | California | United States | 37.74 | -120.94 | 98 | |
| Riverbend | city | California | United States | 36.76 | -119.51 | 830 | |
| Riverbend Family Mobile Home Park | city | California | United States | 37.37 | -121.89 | 68 | |
| Riverdale | city | California | United States | 39.89 | -123.75 | 830 | |
| Riverdale | city | California | United States | 36.43 | -119.86 | 196 | |
| Riverdale Park | city | California | United States | 37.61 | -121.05 | 59 | |
| Riverkern | city | California | United States | 35.79 | -118.45 | 2785 | |
| Riverland Mobile Home Park | city | California | United States | 40.49 | -122.33 | 416 | |
| Riversaida | city | California | United States | 33.95 | -117.40 | 882 | |
| Riversayd | city | California | United States | 33.95 | -117.40 | 882 | |
| Riverside | city | California | United States | 38.52 | -121.52 | 9 | |
| Riverside | city | California | United States | 33.95 | -117.40 | 882 | |
| Riverside | city | California | United States | 37.64 | -120.95 | 98 | |
| Riverside | city | California | United States | 40.86 | -123.97 | 830 | |
| Riverside Grove | city | California | United States | 37.17 | -122.14 | 830 | |
| Riverside Junction | city | California | United States | 33.99 | -117.36 | 921 | |
| Riverside Mobile Home Park | city | California | United States | 38.58 | -121.54 | 13 | |
| Riverside Mobile Park | city | California | United States | 40.59 | -122.39 | 830 | |
| Riverside Park | city | California | United States | 40.50 | -123.99 | 262 | |
| Riverton | city | California | United States | 38.77 | -120.45 | 3431 | |
| Riverview | city | California | United States | 38.50 | -121.56 | 3 | |
| Riverview | city | California | United States | 32.86 | -116.93 | 400 | |
| Riverview | city | California | United States | 40.92 | -122.40 | 1197 | |
| Riverview (historical) | city | California | United States | 36.85 | -119.86 | 298 | |
| Riverview Farms | city | California | United States | 32.85 | -116.93 | 830 | |
| Riverwood Mobile Home Estates | city | California | United States | 41.19 | -122.28 | 2509 | |
| Riviera | city | California | United States | 34.06 | -118.50 | 377 | |
| Riviera (historical) | city | California | United States | 39.30 | -121.66 | 78 | |
| Riviera Estates | city | California | United States | 38.98 | -122.74 | 1669 | |
| Riviera Mobile Estates | city | California | United States | 40.47 | -122.28 | 400 | |
| Riviera Mobile Home Park | city | California | United States | 33.06 | -117.30 | 49 | |
| Riviera Shores | city | California | United States | 32.78 | -117.24 | 3 | |
| Riviera Villas | city | California | United States | 32.73 | -117.25 | 216 | |
| Riviera West | city | California | United States | 38.99 | -122.75 | 1669 |