| School | District | Grades | Population | Address - click for map | Phone |
| Canyon View High | Chaffey Joint Union High | 11-12 | 212 | 557 West Fifth St., Ontario, CA 91762 | (909) 983–7102 |
| Chaffey Community Day | Chaffey Joint Union High | 9-12 | 27 | 525 West Fifth St., Ontario, CA 91762 | (909) 983–8413 |
| Chaffey High | Chaffey Joint Union High | 9-12 | 3407 | 1245 North Euclid Ave., Ontario, CA 91762 | (909) 988–5560 |
| Ontario High | Chaffey Joint Union High | 9-12 | 2690 | 901 West Francis St., Ontario, CA 91762 | (909) 988–7411 |
| El Camino Elementary | Ontario-montclair Elementary | K-6 | 820 | 1525 West Fifth St., Ontario, CA 91762 | (909) 986–6402 |
| Elderberry Elementary | Ontario-montclair Elementary | K-6 | 847 | 950 North Elderberry Ave., Ontario, CA 91762 | (909) 986–0108 |
| Euclid Elementary | Ontario-montclair Elementary | 1-6 | 634 | 1120 South Euclid Ave., Ontario, CA 91762 | (909) 984–5119 |
| Hawthorne Elementary | Ontario-montclair Elementary | K-6 | 853 | 705 West Hawthorne St., Ontario, CA 91762 | (909) 986–6582 |
| Mission Elementary | Ontario-montclair Elementary | K-6 | 952 | 5555 Howard St., Ontario, CA 91762 | (909) 627–3010 |
| Oaks Middle | Ontario-montclair Elementary | 7-8 | 1010 | 1221 South Oaks Ave., Ontario, CA 91762 | (909) 988–2050 |
| Richard Haynes Elementary | Ontario-montclair Elementary | K-6 | 922 | 715 West Francis St., Ontario, CA 91762 | (909) 984–1759 |
| Vina Danks Middle | Ontario-montclair Elementary | 6-8 | 1113 | 1020 North Vine Ave., Ontario, CA 91762 | (909) 983–2691 |
| Vista Grande Elementary | Ontario-montclair Elementary | K-6 | 613 | 1390 West Francis St., Ontario, CA 91762 | (909) 988–2234 |
| Echos Of Faith Christian School | Private | K-8 | 133 | 11255 S Central Avenue, Ontario, CA 91762 | (909) 627–3078 |
| First United Methodist Preschool & Kinde | Private | PK | 61 | 918 North Euclid Avenue, Ontario, CA 91762 | (909) 983–3868 |
| Mount Zion Christian School | Private | PK | 23 | 224a West California Street, Ontario, CA 91762 | (909) 988–2280 |
| Ontario Christian High School | Private | 9-12 | 468 | 931 W Philadelphia Street, Ontario, CA 91762 | (909) 984–1756 |
| Ontario Christian School | Private | K-8 | 808 | 931 W Philadelphia Street, Ontario, CA 91762 | (909) 983–1010 |
| Ontario Progressive Montessori School | Private | PK | 18 | 328 West Phillips Street, Ontario, CA 91762 | (760) 323–2502 |
| Redeemer Lutheran Christian School | Private | K-8 | 134 | 920 West 6th Street, Ontario, CA 91762 | (909) 986–6510 |
| St George Parish School | Private | PK | 262 | 322 W D Street, Ontario, CA 91762 | (909) 984–9123 |
