| City | County | 2026 Pop. ↓ |
|---|---|---|
| Yuba City | Sutter County | 69,342 |
| Yorba Linda | Orange County | 65,121 |
| Yucaipa | San Bernardino County | 54,989 |
| Yucca Valley | San Bernardino County | 21,926 |
| Yreka | Siskiyou County | 7,693 |
| Yosemite Lakes | Madera County | 5,128 |
| Yountville | Napa County | 3,161 |
| Yosemite Valley | Mariposa County | 2,036 |
| Yermo | San Bernardino County | 1,041 |
| Yankee Hill | Butte County | 396 |
| Yolo | Yolo County | 221 |
| Yettem | Tulare County | 82 |
| Yosemite West | Mariposa County | 43 |