| Business | Phone |
| Arroyo Elementary School 1700 E 7th St, Ontario 91764 | (909) 985-1012 |
| Berlyn Elementary School 1320 N Berlyn Ave, Ontario 91764 | (909) 986-8995 |
| Bernt Elementary School 2230 E 4th St, Ontario 91764 | (909) 988-8962 |
| Bon View Elementary School 2121 S Bon View Ave, Ontario 91761 | (909) 947-3932 |
| Canyon View High School 557 W 5th St, Ontario 91762 | (909) 983-7102 |
| Central Elementary School 415 E G St, Ontario 91764 | (909) 983-8522 |
| Chaffey High School 245 N Euclid Ave, Ontario 91762 | (909) 988-5560 |
| Chaffey Joint Adult High Schl 211 W 5th St, Ontario 91762 | (909) 983-2010 |
| Chaffey Joint Union Hs Dist 211 W 5th St, Ontario 91762 | (909) 988-8511 |
| Chaffey Joint Union Schl Dist 404 W 4th St, Ontario 91762 | (909) 467-5157 |
| Colony High School 3850 E Riverside Dr, Ontario 91761 | (909) 930-2929 |
| Consulting Assistance Projects 428 Sonoma Ct, Ontario 91762 | (909) 983-3682 |
| Corona Elementary School 1140 N Corona Ave, Ontario 91764 | (909) 984-6411 |
| Creek View Elementary School 3742 Lytle Creek Loop, Ontario 91761 | (909) 947-8385 |
| De Anza Middle School 1450 S Sultana Ave, Ontario 91761 | (909) 986-8577 |
| Del Norte Elementary School 850 N Del Norte Ave, Ontario 91764 | (909) 986-9515 |
| Edison Elementary School 515 E 6th St, Ontario 91764 | (909) 984-5618 |
| El Camino Elementary School 1525 W 5th St, Ontario 91762 | (909) 986-6402 |
| Elderberry Elementary School 950 N Elderberry Ave, Ontario 91762 | (909) 986-0108 |
| Franklin Career College 1274 Slater Cir, Ontario 91761 | (909) 937-9007 |
| Grace Yokley Middle School 2947 S Turner Ave, Ontario 91761 | (909) 947-6774 |
| Hawthorne Elementary School 705 W Hawthorne St, Ontario 91762 | (909) 986-6582 |
| Haynes Elementary School 715 W Francis St, Ontario 91762 | (909) 984-1759 |
| Inland Empire Ntma Training 1717 S Grove Ave, Ontario 91761 | (909) 947-9363 |
| Levi H Dickey Elementary 2840 S Parco Ave, Ontario 91761 | (909) 947-6693 |
| Lincoln Elementary School 440 N Allyn Ave, Ontario 91764 | (909) 983-9803 |
| Linda Vista Preschool 1556 S Sultana Ave, Ontario 91761 | (909) 983-5578 |
| Little Learners Preschool 965 E 6th St, Ontario 91764 | (909) 931-0140 |
| Mariposa Elementary School 1605 E D St, Ontario 91764 | (909) 983-4116 |
| Mission Elementary School 5555 Howard St, Ontario 91762 | (909) 627-3010 |
| Mount Zion Christian School 224 W California St, Ontario 91762 | (909) 988-2280 |
| Mountain View Elementary 2825 E Walnut St, Ontario 91761 | (909) 947-3516 |
| Mountain View School District 2585 S Archibald Ave, Ontario 91761 | (909) 947-2205 |
| Euclid Elementary School 1120 S Euclid Ave, Ontario 91762 | (909) 984-5119 |
| Oaks Middle School 1221 S Oaks Ave, Ontario 91762 | (909) 988-2050 |
| Ontario Center School 835 N Center Ave, Ontario 91764 | (909) 948-3044 |
| Ontario Christian High School 931 W Philadelphia St, Ontario 91762 | (909) 984-1756 |
| Ontario Christian Military 1550 N Palmetto Ave # A, Ontario 91762 | (909) 460-9966 |
| Ontario Christian Schools 1907 S Euclid Ave, Ontario 91762 | (909) 983-1010 |
| Ontario High School 901 W Francis St, Ontario 91762 | (909) 988-7411 |
| Ontario-Montclair School Dist 950 W D St, Ontario 91762 | (909) 459-2500 |
| Ranch View School 3300 Old Archibald Ranch Rd, Ontario 91761 | (909) 947-5545 |
| San Antonio Junior Academy 1722 E 8th St, Ontario 91764 | (909) 982-2301 |
| School Advisors 3270 Inland Empire Blvd, Ontario 91764 | (909) 466-4797 |
| St George School 322 W D St, Ontario 91762 | (909) 984-9123 |
| Sultana Elementary School 1845 S Sultana Ave, Ontario 91761 | (909) 986-1215 |
| United Education Institute 3380 Shelby St # 150, Ontario 91764 | (909) 476-2424 |
| Valley View High 1801 E 6th St, Ontario 91764 | (909) 985-0966 |
| Vina Danks Middle School 1020 N Vine Ave, Ontario 91762 | (909) 983-2691 |
| Vineyard Elementary School 1500 E 6th St, Ontario 91764 | (909) 984-2306 |
| Vista Grande Elementary School 1390 W Francis St, Ontario 91762 | (909) 988-2234 |
| Wiltsey Middle School 1450 E G St, Ontario 91764 | (909) 986-5838 |
| Woodcrest Junior High School 2725 S Campus Ave, Ontario 91761 | (909) 923-3455 |