| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Ibis | city | California | United States | 34.94 | -114.79 | 1669 | |
| Iceland | city | California | United States | 39.38 | -120.03 | 6709 | |
| Ideal Mobile Home Park | city | California | United States | 39.74 | -122.00 | 141 | |
| Idle Wheel Mobile Estates | city | California | United States | 38.67 | -121.74 | 39 | |
| Idlewild | city | California | United States | 41.90 | -123.77 | 1669 | |
| Idlewild | city | California | United States | 39.11 | -120.16 | 6227 | |
| Idlewild | city | California | United States | 35.81 | -118.67 | 4189 | |
| Idria | city | California | United States | 36.42 | -120.67 | 2834 | |
| Idyllwild | city | California | United States | 33.74 | -116.72 | 5869 | |
| Igerna | city | California | United States | 41.40 | -122.38 | 4189 | |
| Ignacio | city | California | United States | 38.07 | -122.54 | 91 | |
| Igo | city | California | United States | 40.51 | -122.54 | 997 | |
| Illinoistown (historical) | city | California | United States | 39.09 | -120.96 | 2509 | |
| Ilmon | city | California | United States | 35.31 | -118.69 | 1669 | |
| Imhoff | city | California | United States | 36.21 | -119.33 | 255 | |
| Imola | city | California | United States | 38.28 | -122.28 | 3 | |
| Imperial | city | California | United States | 32.85 | -115.57 | -1689 | |
| Imperial Beach | city | California | United States | 32.58 | -117.11 | 52 | |
| Imperial Courts | city | California | United States | 33.93 | -118.23 | 95 | |
| Imperial Escondido Estates Mobile Home Park | city | California | United States | 33.14 | -117.05 | 830 | |
| Inca | city | California | United States | 33.80 | -114.77 | 830 | |
| Inceville | city | California | United States | 34.04 | -118.56 | 0 | |
| Incline | city | California | United States | 37.66 | -119.85 | 2660 | |
| Indak (historical) | city | California | United States | 38.73 | -120.80 | 2509 | |
| Independence | city | California | United States | 38.35 | -120.51 | 2601 | |
| Independence | city | California | United States | 36.80 | -118.20 | 4189 | |
| Indian Creek | city | California | United States | 38.18 | -120.43 | 3349 | |
| Indian Creek Trailer Park | city | California | United States | 41.80 | -123.38 | 1197 | |
| Indian Falls | city | California | United States | 40.06 | -120.96 | 3349 | |
| Indian Gulch | city | California | United States | 37.44 | -120.20 | 1000 | |
| Indian Hill (historical) | city | California | United States | 39.51 | -120.99 | 3349 | |
| Indian Hills | city | California | United States | 38.17 | -120.38 | 3349 | |
| Indian Lakes Estates | city | California | United States | 37.21 | -119.68 | 2509 | |
| Indian Oaks | city | California | United States | 33.61 | -117.02 | 1669 | |
| Indian Springs | city | California | United States | 39.73 | -123.37 | 1056 | |
| Indian Springs | city | California | United States | 37.05 | -119.73 | 830 | |
| Indian Springs | city | California | United States | 34.33 | -118.33 | 2509 | |
| Indian Springs | city | California | United States | 32.72 | -116.88 | 1026 | |
| Indian Velsas | city | California | United States | 33.72 | -116.31 | 101 | |
| Indian Village | city | California | United States | 36.45 | -116.87 | -1689 | |
| Indian Wells | city | California | United States | 35.67 | -117.87 | 2713 | |
| Indian Wells | city | California | United States | 33.72 | -116.31 | 101 | |
| Indian Wells Mobile Home Park | city | California | United States | 33.70 | -116.27 | 59 | |
| Indianola | city | California | United States | 40.69 | -124.23 | 137 | |
| Indianola | city | California | United States | 40.81 | -124.08 | 196 | |
| Indio | city | California | United States | 33.72 | -116.22 | -1689 | |
| Indio Hills | city | California | United States | 33.83 | -116.23 | 1197 | |
| Industry | city | California | United States | 34.02 | -117.96 | 318 | |
| Ingle | city | California | United States | 36.72 | -120.26 | 160 | |
| Inglenook | city | California | United States | 39.53 | -123.76 | 193 | |
| Ingleside | city | California | United States | 37.72 | -122.45 | 255 | |
| Ingleside Heights | city | California | United States | 37.71 | -122.47 | 393 | |
| Ingleside Terrace | city | California | United States | 37.72 | -122.47 | 367 | |
| Inglewood | city | California | United States | 33.96 | -118.35 | 121 | |
| Inglvudas | city | California | United States | 33.96 | -118.35 | 121 | |
| Ingomar | city | California | United States | 37.18 | -120.97 | 91 | |
| Ingot | city | California | United States | 40.73 | -122.08 | 1669 | |
| Ingram | city | California | United States | 38.89 | -123.17 | 958 | |
| Inmans (historical) | city | California | United States | 35.43 | -118.35 | 7549 | |
| Inperial Gables | city | California | United States | 33.13 | -114.93 | 1233 | |
| Inskip | city | California | United States | 39.99 | -121.54 | 4573 | |
| Interlaken | city | California | United States | 36.95 | -121.73 | 72 | |
| Inverness | city | California | United States | 38.10 | -122.86 | 167 | |
| Inverness Park | city | California | United States | 38.06 | -122.82 | 131 | |
| Inwood | city | California | United States | 40.52 | -121.96 | 2509 | |
| Inyokern | city | California | United States | 35.65 | -117.81 | 2509 | |
| Ione | city | California | United States | 38.35 | -120.93 | 377 | |
| Iosephopolis | city | California | United States | 37.34 | -121.89 | 82 | |
| Iowa City | city | California | United States | 39.29 | -121.48 | 196 | |
| Iowa Hill | city | California | United States | 39.11 | -120.86 | 2598 | |
| Iremel | city | California | United States | 34.92 | -120.53 | 98 | |
| Iris | city | California | United States | 33.20 | -115.40 | 32 | |
| Irish Place (historical) | city | California | United States | 40.13 | -122.54 | 830 | |
| Irish Town | city | California | United States | 39.81 | -121.63 | 1669 | |
| Irishtown (historical) | city | California | United States | 38.39 | -120.67 | 2024 | |
| Irma | city | California | United States | 34.43 | -119.75 | 196 | |
| Irmulco | city | California | United States | 39.42 | -123.52 | 396 | |
| Iron Horse | city | California | United States | 39.79 | -120.50 | 5029 | |
| Iron Mountain | city | California | United States | 40.67 | -122.52 | 3349 | |
| Ironsides | city | California | United States | 33.81 | -118.31 | 98 | |
| Irrigosa | city | California | United States | 36.89 | -119.99 | 213 | |
| Irvinas | city | California | United States | 33.67 | -117.82 | 68 | |
| Irvine | city | California | United States | 33.67 | -117.82 | 68 | |
| Irving (historical) | city | California | United States | 38.02 | -122.72 | 830 | |
| Irvings Crest | city | California | United States | 32.98 | -116.91 | 1669 | |
| Irvington District | city | California | United States | 37.52 | -121.97 | 36 | |
| Irwin | city | California | United States | 37.40 | -120.85 | 98 | |
| Irwin Estates | city | California | United States | 34.92 | -117.03 | 2509 | |
| Irwindale | city | California | United States | 34.11 | -117.94 | 830 | |
| Isabella (historical) | city | California | United States | 35.66 | -118.46 | 2660 | |
| Isaiah (historical) | city | California | United States | 39.72 | -121.44 | 2001 | |
| Isla Vista | city | California | United States | 34.41 | -119.86 | 3 | |
| Island Mountain | city | California | United States | 40.03 | -123.49 | 830 | |
| Island View Trailer Park | city | California | United States | 33.63 | -117.94 | 95 | |
| Isleton | city | California | United States | 38.16 | -121.61 | -1689 | |
| Italian Swiss Colony | city | California | United States | 36.93 | -120.11 | 246 | |
| Ivanhoe | city | California | United States | 36.39 | -119.22 | 328 | |
| Ivanpah | city | California | United States | 35.34 | -115.31 | 3589 | |
| Iverson Indian Rancheria | city | California | United States | 38.94 | -123.68 | 193 | |
| Ivesta | city | California | United States | 36.72 | -119.64 | 298 | |
| Ivory | city | California | United States | 36.57 | -119.42 | 298 | |
| Ivy del Mobile Home Park | city | California | United States | 33.17 | -117.11 | 898 |