| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Ueland Place | city | California | United States | 40.31306 | -123.39556 | 3024 | 47 |
| Ukiah | city | California | United States | 39.15028 | -123.20667 | 643 | 17725 |
| Ukiah Rancheria | city | California | United States | 39.09028 | -123.15833 | 738 | 7190 |
| Ulatis Park subdivision | city | California | United States | 38.35833 | -121.98778 | 167 | 74429 |
| Ulmar | city | California | United States | 37.70306 | -121.715 | 570 | 40137 |
| Ultra | city | California | United States | 35.96417 | -118.9975 | 564 | 3437 |
| Una | city | California | United States | 35.42444 | -119.17694 | 334 | 6515 |
| Underwood Park | city | California | United States | 39.86 | -123.71583 | 1197 | 252 |
| Union | city | California | United States | 38.32139 | -122.30889 | 65 | 62240 |
| Union | city | California | United States | 35.6375 | -120.56 | 1020 | 2220 |
| Union City | city | California | United States | 37.59639 | -122.08056 | 170 | 175814 |
| Union City | city | California | United States | 37.59583 | -122.01806 | 147 | 163731 |
| Union Hill | city | California | United States | 39.20556 | -121.0375 | 2798 | 17694 |
| Union Hill | city | California | United States | 39.59722 | -121.00222 | 4222 | 391 |
| Union Landing | city | California | United States | 39.69944 | -123.80056 | 337 | 103 |
| Union Mills | city | California | United States | 39.35389 | -120.10611 | 6105 | 5261 |
| Unionville historical | city | California | United States | 39.47306 | -120.85222 | 4796 | 231 |
| Universal City | city | California | United States | 34.13889 | -118.3525 | 666 | 369082 |
| University City | city | California | United States | 32.85472 | -117.20306 | 305 | 165622 |
| University Heights | city | California | United States | 34.19944 | -117.35 | 1706 | 70119 |
| University Heights | city | California | United States | 32.75556 | -117.13861 | 321 | 320084 |
| University Village | city | California | United States | 34.06583 | -117.16111 | 1502 | 76435 |
| University Village subdivision | city | California | United States | 37.885 | -122.3 | 85 | 194689 |
| Upland | city | California | United States | 34.0975 | -117.6475 | 1230 | 217033 |
| Upp | city | California | United States | 39.42722 | -123.35583 | 1397 | 6756 |
| Upper Forni | city | California | United States | 38.82222 | -120.17167 | 7595 | 205 |
| Upper Lake | city | California | United States | 39.16472 | -122.90944 | 1371 | 910 |
| Upper Town | city | California | United States | 38.35444 | -119.11694 | 8172 | 105 |
| Upton | city | California | United States | 41.34111 | -122.34694 | 3710 | 1756 |
| Urgon | city | California | United States | 38.15806 | -121.27056 | 52 | 57510 |
| Uva | city | California | United States | 36.61889 | -119.48889 | 301 | 26532 |
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