Rankings · California
Largest schools in Ontario, California
Ranked by enrollment — academic rankings appear once test-score data is loaded.
| # | School | City | District | Enrollment |
|---|---|---|---|---|
| 1 | Chaffey High | Ontario | Chaffey Joint Union High | 3346 |
| 2 | Ontario High | Ontario | Chaffey Joint Union High | 2182 |
| 3 | Colony High | Ontario | Chaffey Joint Union High | 2122 |
| 4 | Ray Wiltsey Middle | Ontario | Ontario-Montclair | 799 |
| 5 | Central Language Academy | Ontario | Ontario-Montclair | 733 |
| 6 | Oaks Middle | Ontario | Ontario-Montclair | 726 |
| 7 | Park View Elementary | Ontario | Mountain View Elementary | 722 |
| 8 | Richard Haynes Elementary | Ontario | Ontario-Montclair | 690 |
| 9 | Edison Elementary | Ontario | Ontario-Montclair | 680 |
| 10 | Sultana Elementary | Ontario | Ontario-Montclair | 649 |
| 11 | Grace Yokley Junior High | Ontario | Mountain View Elementary | 636 |
| 12 | Vineyard Elementary | Ontario | Ontario-Montclair | 629 |
| 13 | Vina Danks Middle | Ontario | Ontario-Montclair | 626 |
| 14 | Bon View Elementary | Ontario | Ontario-Montclair | 620 |
| 15 | Berlyn Elementary | Ontario | Ontario-Montclair | 619 |
| 16 | Euclid Language Academy | Ontario | Ontario-Montclair | 595 |
| 17 | Mariposa Elementary | Ontario | Ontario-Montclair | 591 |
| 18 | Ranch View Elementary | Ontario | Mountain View Elementary | 590 |
| 19 | Elderberry Elementary | Ontario | Ontario-Montclair | 578 |
| 20 | Hawthorne Elementary | Ontario | Ontario-Montclair | 577 |
| 21 | Lincoln Elementary | Ontario | Ontario-Montclair | 561 |
| 22 | Creek View Elementary | Ontario | Mountain View Elementary | 550 |
| 23 | Liberty Elementary | Ontario | Chino Valley Unified | 549 |
| 24 | Ontario Center | Ontario | Cucamonga Elementary | 548 |
| 25 | Mission Elementary | Ontario | Ontario-Montclair | 545 |
| 26 | Mountain View Elementary | Ontario | — | 537 |
| 27 | De Anza Middle | Ontario | Ontario-Montclair | 530 |
| 28 | El Camino Elementary | Ontario | Ontario-Montclair | 471 |
| 29 | Arroyo Elementary | Ontario | Ontario-Montclair | 467 |
| 30 | Levi H. Dickey Elementary | Ontario | Chino Valley Unified | 433 |
| 31 | Del Norte Elementary | Ontario | Ontario-Montclair | 432 |
| 32 | Vista Grande Elementary | Ontario | Ontario-Montclair | 402 |
| 33 | Corona Elementary | Ontario | Ontario-Montclair | 393 |
| 34 | Valley View High (Continuation) | Ontario | Chaffey Joint Union High | 368 |
| 35 | Woodcrest Junior High | Ontario | Chino Valley Unified | 334 |
| 36 | Online Academy | Ontario | Ontario-Montclair | 184 |
| 37 | Chaffey District Online High | Ontario | Chaffey Joint Union High | 102 |
| 38 | Chaffey Community Day | Ontario | Chaffey Joint Union High | 16 |
| 39 | Baldy View ROP | Ontario | — | 0 |