| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Yager Junction | city | California | United States | 40.54833 | -123.82333 | 2798 | 769 |
| Yaldora | city | California | United States | 33.23278 | -117.39278 | 104 | 42168 |
| Yankee Hill | city | California | United States | 39.70361 | -121.52111 | 1591 | 2252 |
| Yankee Hill | city | California | United States | 38.03972 | -120.37694 | 2486 | 8134 |
| Yankee Jims | city | California | United States | 39.02944 | -120.86056 | 2795 | 801 |
| Yarmouth historical | city | California | United States | 37.68667 | -121.34722 | 75 | 2502 |
| Ydaloom historical | city | California | United States | 40.77889 | -122.21972 | 1154 | 1171 |
| Yellowjacket | city | California | United States | 40.24056 | -121.69 | 3999 | 201 |
| Yellowjacket Place | city | California | United States | 40.16944 | -123.3225 | 2798 | 47 |
| Yermo | city | California | United States | 34.905 | -116.81944 | 1909 | 156 |
| Yettem | city | California | United States | 36.48639 | -119.25861 | 321 | 8509 |
| Yokohl | city | California | United States | 36.32556 | -119.08139 | 597 | 3043 |
| Yolano | city | California | United States | 38.41028 | -121.70444 | 19 | 996 |
| Yolo | city | California | United States | 38.73194 | -121.80667 | 65 | 18198 |
| Yontocket | city | California | United States | 41.90778 | -124.19778 | 26 | 446 |
| Yorba | city | California | United States | 33.86528 | -117.80806 | 272 | 183963 |
| Yorba Linda | city | California | United States | 33.88861 | -117.81222 | 396 | 139398 |
| Yorkville | city | California | United States | 38.89806 | -123.21333 | 1233 | 365 |
| Yosemite Forks | city | California | United States | 37.36722 | -119.63083 | 2683 | 4100 |
| Yosemite Junction | city | California | United States | 37.89083 | -120.48722 | 1213 | 2493 |
| Yosemite Lakes | city | California | United States | 37.19111 | -119.77167 | 1220 | 1041 |
| Yosemite Lakes Park | city | California | United States | 37.18194 | -119.76722 | 1233 | 1041 |
| Yosemite Village | city | California | United States | 37.74528 | -119.59722 | 3999 | 229 |
| Yosemite West | city | California | United States | 37.6475 | -119.7175 | 6197 | 567 |
| You Bet | city | California | United States | 39.20917 | -120.89889 | 2759 | 3677 |
| Youngs Hill historical | city | California | United States | 39.47694 | -121.06667 | 2598 | 745 |
| Youngstown | city | California | United States | 38.17389 | -121.24194 | 65 | 17978 |
| Yountville | city | California | United States | 38.40167 | -122.35972 | 88 | 10575 |
| Yreka | city | California | United States | 41.73556 | -122.63333 | 2690 | 1627 |
| Ysidora historical | city | California | United States | 33.25972 | -117.36278 | 193 | 40943 |
| Yuba City | city | California | United States | 39.14056 | -121.61583 | 55 | 63075 |
| Yuba Pass | city | California | United States | 39.32306 | -120.59917 | 5964 | 389 |
| Yuba historical | city | California | United States | 39.11917 | -121.56944 | 62 | 48562 |
| Yucaipa | city | California | United States | 34.03361 | -117.04222 | 2644 | 42125 |
| Yucca Grove | city | California | United States | 35.4025 | -115.79139 | 4196 | 70 |
| Yucca Inn | city | California | United States | 34.40972 | -117.58861 | 4609 | 3783 |
| Yucca Valley | city | California | United States | 34.11417 | -116.43139 | 3379 | 11377 |
| Yulupa historical | city | California | United States | 38.34167 | -122.50444 | 167 | 16136 |
| Yuman historical | city | California | United States | 39.5125 | -121.55694 | 193 | 20294 |
| Yupu historical | city | California | United States | 39.13333 | -121.61667 | 55 | 63075 |
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