| Arroyo Elementary | K - 6 | 708 | 21.5 | Ontario, 91764 |
| Berlyn Elementary | K - 6 | 961 | 22.9 | Ontario, 91764 |
| Bernt Elementary | K | 321 | 18.9 | Ontario, 91764 |
| Bon View Elementary | 1 - 6 | 793 | 22.7 | Ontario, 91761 |
| Central Elementary | K - 6 | 580 | 21.5 | Ontario, 91764 |
| Corona Elementary | 1 - 6 | 699 | 20.6 | Ontario, 91764 |
| Creek View Elementary | K - 5 | 736 | 20.7 | Ontario, 91761 |
| Del Norte Elementary | 1 - 6 | 787 | 24.6 | Ontario, 91764 |
| Edison Elementary | K - 5 | 527 | 21.1 | Ontario, 91764 |
| El Camino Elementary | K - 6 | 820 | 21.0 | Ontario, 91762 |
| Elderberry Elementary | K - 6 | 847 | 21.7 | Ontario, 91762 |
| Euclid Elementary | 1 - 6 | 634 | 21.9 | Ontario, 91762 |
| Hawthorne Elementary | K - 6 | 853 | 23.1 | Ontario, 91762 |
| Levi H. Dickey Elementary | K - 6 | 791 | 21.4 | Ontario, 91710 |
| Liberty Elementary | K - 6 | 766 | 23.2 | Ontario, 91761 |
| Lincoln Elementary | K - 8 | 372 | 12.0 | Ontario, 91764 |
| Linda Vista Elementary | K | 383 | 18.2 | Ontario, 91761 |
| Mariposa Elementary | 1 - 6 | 836 | 23.9 | Ontario, 91764 |
| Mission Elementary | K - 6 | 952 | 22.1 | Ontario, 91762 |
| Mountain View Elementary | K - 5 | 588 | 20.3 | Ontario, 91761 |
| Ranch View Elementary | K - 5 | 733 | 20.6 | Ontario, 91761 |
| Richard Haynes Elementary | K - 6 | 922 | 23.6 | Ontario, 91762 |
| Sultana Elementary | K - 6 | 960 | 22.0 | Ontario, 91761 |
| The Ontario Center | K - 5 | 772 | 22.7 | Ontario, 91764 |
| Vineyard Elementary | K - 6 | 646 | 21.5 | Ontario, 91764 |
| Vista Grande Elementary | K - 6 | 613 | 23.6 | Ontario, 91762 |
| De Anza Middle | 6 - 8 | 951 | 22.1 | Ontario, 91761 |
| Grace Yokley Middle | 6 - 8 | 1,257 | 24.6 | Ontario, 91761 |
| Oaks Middle | 7 - 8 | 1,010 | 21.3 | Ontario, 91762 |
| Ray Wiltsey Middle | 7 - 8 | 1,027 | 20.8 | Ontario, 91764 |
| Vina Danks Middle | 6 - 8 | 1,113 | 22.3 | Ontario, 91762 |
| Woodcrest Junior High | 7 - 8 | 542 | 23.5 | Ontario, 91761 |
| Canyon View High | 11 - 12 | 212 | 19.3 | Ontario, 91762 |
| Chaffey Community Day | 9 - 12 | 27 | 5.4 | Ontario, 91762 |
| Chaffey High | 9 - 12 | 3,407 | 23.5 | Ontario, 91762 |
| Colony High | 9 - 12 | 2,323 | 24.3 | Ontario, 91761 |
| Ontario High | 9 - 12 | 2,690 | 23.6 | Ontario, 91762 |
| Valley View High (Continuation) | 9 - 12 | 822 | 20.9 | Ontario, 91764 |
