| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Ibis | city | California | United States | 34.94 | -114.79167 | 1437 | 46 |
| Iceland | city | California | United States | 39.37556 | -120.025 | 6397 | 789 |
| Idlewild | city | California | United States | 41.89861 | -123.77083 | 1666 | 476 |
| Idlewild | city | California | United States | 39.10889 | -120.15833 | 6227 | 960 |
| Idlewild | city | California | United States | 35.81083 | -118.67111 | 3795 | 172 |
| Idria | city | California | United States | 36.41694 | -120.67333 | 2834 | 187 |
| Idyllwild | city | California | United States | 33.74 | -116.71806 | 5485 | 1059 |
| Igerna | city | California | United States | 41.40167 | -122.37833 | 3799 | 1286 |
| Ignacio | city | California | United States | 38.07028 | -122.5375 | 52 | 40592 |
| Igo | city | California | United States | 40.50556 | -122.54056 | 997 | 3331 |
| Ilmon | city | California | United States | 35.3125 | -118.69306 | 1433 | 664 |
| Imhoff | city | California | United States | 36.21444 | -119.33 | 255 | 36005 |
| Imola | city | California | United States | 38.27861 | -122.27944 | 3 | 50220 |
| Imperial | city | California | United States | 32.8475 | -115.56861 | -55 | 22023 |
| Imperial Beach | city | California | United States | 32.58389 | -117.11222 | 55 | 188629 |
| Imperial Courts subdivision | city | California | United States | 33.93139 | -118.23139 | 95 | 619971 |
| Imperial Escondido Estates Mobile Home Park subdivision | city | California | United States | 33.14167 | -117.04722 | 784 | 107367 |
| Inca | city | California | United States | 33.80083 | -114.76556 | 711 | 70 |
| Inceville | city | California | United States | 34.03833 | -118.55444 | 0 | 29267 |
| Incline | city | California | United States | 37.66056 | -119.85167 | 2660 | 866 |
| Indak historical | city | California | United States | 38.72917 | -120.8 | 1998 | 17360 |
| Independence | city | California | United States | 38.34917 | -120.5125 | 2598 | 1265 |
| Independence | city | California | United States | 36.80278 | -118.19917 | 3966 | 42 |
| Indian Creek | city | California | United States | 38.18167 | -120.43333 | 2998 | 1672 |
| Indian Falls | city | California | United States | 40.05694 | -120.96278 | 3198 | 212 |
| Indian Gulch | city | California | United States | 37.43944 | -120.19583 | 997 | 541 |
| Indian Hill historical | city | California | United States | 39.50694 | -120.99139 | 3139 | 201 |
| Indian Hills | city | California | United States | 38.17361 | -120.37639 | 2982 | 1599 |
| Indian Lakes Estates | city | California | United States | 37.21111 | -119.67917 | 2362 | 1048 |
| Indian Oaks | city | California | United States | 33.60556 | -117.02 | 1630 | 4043 |
| Indian Springs | city | California | United States | 39.73361 | -123.37278 | 1056 | 170 |
| Indian Springs | city | California | United States | 37.05056 | -119.73139 | 600 | 451 |
| Indian Springs | city | California | United States | 34.33222 | -118.33278 | 2230 | 29838 |
| Indian Springs | city | California | United States | 32.72028 | -116.88 | 1026 | 35880 |
| Indian Village | city | California | United States | 36.44917 | -116.87333 | -177 | 5 |
| Indian Wells | city | California | United States | 35.66528 | -117.87222 | 2713 | 1081 |
| Indian Wells | city | California | United States | 33.71861 | -116.3075 | 101 | 25136 |
| Indian Wells Mobile Home Park | city | California | United States | 33.70083 | -116.26556 | 59 | 29699 |
| Indianola | city | California | United States | 40.68639 | -124.23222 | 137 | 4565 |
| Indianola | city | California | United States | 40.81278 | -124.08194 | 196 | 11245 |
| Indio | city | California | United States | 33.72056 | -116.21472 | -16 | 53316 |
| Indio Hills | city | California | United States | 33.83111 | -116.23056 | 1197 | 9847 |
| Industry | city | California | United States | 34.01972 | -117.95778 | 318 | 266539 |
| Ingle | city | California | United States | 36.72139 | -120.25556 | 160 | 1110 |
| Inglenook | city | California | United States | 39.52972 | -123.75778 | 193 | 981 |
| Ingleside | city | California | United States | 37.72306 | -122.45194 | 255 | 583483 |
| Inglewood | city | California | United States | 33.96167 | -118.35222 | 121 | 510519 |
| Ingomar | city | California | United States | 37.18028 | -120.96722 | 91 | 1349 |
| Ingot | city | California | United States | 40.72778 | -122.07806 | 1601 | 308 |
| Ingram | city | California | United States | 38.89028 | -123.17083 | 797 | 333 |
| Inmans historical | city | California | United States | 35.42833 | -118.35083 | 7427 | 660 |
| Inperial Gables | city | California | United States | 33.1275 | -114.92833 | 1233 | 42 |
| Inskip | city | California | United States | 39.99 | -121.54 | 4573 | 3008 |
| Interlaken | city | California | United States | 36.95139 | -121.73278 | 72 | 44587 |
| Inverness | city | California | United States | 38.10111 | -122.85583 | 167 | 766 |
| Inverness Park | city | California | United States | 38.06389 | -122.82167 | 131 | 743 |
| Inwood | city | California | United States | 40.52417 | -121.95611 | 2165 | 313 |
| Inyokern | city | California | United States | 35.64694 | -117.81167 | 2434 | 1300 |
| Ione | city | California | United States | 38.35278 | -120.93167 | 377 | 2890 |
| Iowa City | city | California | United States | 39.29167 | -121.47639 | 196 | 1476 |
| Iowa Hill | city | California | United States | 39.10861 | -120.85833 | 2598 | 622 |
| Iremel | city | California | United States | 34.92333 | -120.52556 | 98 | 12709 |
| Iris | city | California | United States | 33.19528 | -115.40361 | 65 | 582 |
| Irish Place historical | city | California | United States | 40.13111 | -122.53389 | 800 | 208 |
| Irish Town | city | California | United States | 39.8125 | -121.62472 | 1676 | 16299 |
| Irishtown historical | city | California | United States | 38.38889 | -120.67361 | 2024 | 5994 |
| Irma | city | California | United States | 34.42944 | -119.7525 | 196 | 78932 |
| Irmulco | city | California | United States | 39.42222 | -123.51639 | 396 | 1025 |
| Iron Horse | city | California | United States | 39.78833 | -120.49583 | 4986 | 265 |
| Iron Mountain | city | California | United States | 40.67083 | -122.52306 | 2998 | 321 |
| Ironsides | city | California | United States | 33.81111 | -118.30528 | 98 | 296349 |
| Irrigosa | city | California | United States | 36.89111 | -119.98639 | 213 | 4884 |
| Irvine | city | California | United States | 33.66944 | -117.82222 | 68 | 202684 |
| Irving historical | city | California | United States | 38.01694 | -122.72333 | 465 | 2308 |
| Irvings Crest | city | California | United States | 32.97972 | -116.91139 | 1548 | 10961 |
| Irvington District | city | California | United States | 37.52278 | -121.97056 | 36 | 141701 |
| Irwin | city | California | United States | 37.39694 | -120.84889 | 98 | 5744 |
| Irwin Estates | city | California | United States | 34.92139 | -117.02722 | 2152 | 15648 |
| Irwindale | city | California | United States | 34.10694 | -117.93444 | 469 | 253253 |
| Isabella historical | city | California | United States | 35.65556 | -118.46028 | 2660 | 642 |
| Isaiah historical | city | California | United States | 39.71778 | -121.44111 | 2001 | 490 |
| Isla Vista | city | California | United States | 34.41333 | -119.86 | 3 | 42977 |
| Island Mountain | city | California | United States | 40.02639 | -123.48917 | 800 | 71 |
| Island View Trailer Park subdivision | city | California | United States | 33.63472 | -117.93889 | 95 | 232876 |
| Isleton | city | California | United States | 38.16194 | -121.61056 | -3 | 1827 |
| Italian Swiss Colony | city | California | United States | 36.93111 | -120.10556 | 246 | 26062 |
| Ivanhoe | city | California | United States | 36.38722 | -119.21694 | 328 | 12306 |
| Ivanpah | city | California | United States | 35.34056 | -115.30972 | 3589 | 70 |
| Iverson Indian Rancheria | city | California | United States | 38.93556 | -123.6825 | 193 | 355 |
| Ivesta | city | California | United States | 36.72194 | -119.63556 | 298 | 26877 |
| Ivory | city | California | United States | 36.56861 | -119.4225 | 298 | 30822 |
| Ivy del Mobile Home Park | city | California | United States | 33.17111 | -117.105 | 898 | 68462 |
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