| 1 | CASTRO-HERNANDEZ FAMILY CHILD CARE | 4.6★ | None | 14 |
| 2 | CHAVEZ FAMILY CHILD CARE | 4.6★ | None | 14 |
| 3 | CREATIVE KIDS PRESCHOOL1161 EAST RIVERSIDE DRIVE | 4.6★ | None | 56 |
| 4 | CREATIVE KIDS PRESCHOOL1161 EAST RIVERSIDE DRIVE | 4.6★ | None | 15 |
| 5 | CREATIVE KIDS PRESCHOOL1161 EAST RIVERSIDE DRIVE | 4.6★ | None | 75 |
| 6 | EASTER SEALS CHILD DEVELOPMENT CENTER1801 EAST SIXTH STREET | 4.6★ | None | 22 |
| 7 | EASTER SEALS CHILD DEVELOPMENT CENTER1801 EAST SIXTH STREET | 4.6★ | None | 30 |
| 8 | EASTER SEALS CHILD DEVELOPMENT CENTER - ONTARIO2999 SOUTH HAVEN AVENUE | 4.6★ | None | 48 |
| 9 | EASTER SEALS CHILD DEVELOPMENT CENTER - ONTARIO2999 SOUTH HAVEN AVENUE | 4.6★ | None | 48 |
| 10 | GARCIA FAMILY CHILD CARE | 4.6★ | None | 14 |
| 11 | GARCIA FAMILY CHILD CARE | 4.6★ | None | 14 |
| 12 | GUILLEM FAMILY CHILD CARE | 4.6★ | None | 12 |
| 13 | HEAVENLY CARE1030A E RIVERSIDE DRIVE | 4.6★ | None | 16 |
| 14 | HEAVENLY CARE1030A E RIVERSIDE DRIVE | 4.6★ | None | 24 |
| 15 | KID'S CLUB1825 N. VINEYARD | 4.6★ | None | 57 |
| 16 | KID'S CLUB1825 N. VINEYARD | 4.6★ | None | 70 |
| 17 | KINDERCARE LEARNING CENTER2140 SOUTH EUCLID AVENUE | 4.6★ | None | 96 |
| 18 | MAOF ONTARIO EARLY LEARNING CENTER1205 NORTH BAKER AVENUE | 4.6★ | None | 94 |
| 19 | MARQUEZ FAMILY CHILD CARE | 4.6★ | None | 14 |
| 20 | MOUNT ZION CHRISTIAN SCHOOL224 A W. CALIFORNIA STREET | 4.6★ | None | 49 |
| 21 | OMSD/BON VIEW ELEMENTARY SCHOOL2121 SOUTH BON VIEW AVENUE | 4.6★ | None | 24 |
| 22 | OMSD/CORONA ELEMENTARY SCHOOL1140 N. CORONA AVENUE | 4.6★ | None | 24 |
| 23 | OMSD/EL CAMINO ELEMENTARY SCHOOL1525 W. 5TH STREET | 4.6★ | None | 24 |
| 24 | OMSD/HAYNES ELEMENTARY SCHOOL715 WEST FRANCIS STREET | 4.6★ | None | 24 |
| 25 | OMSD/SULTANA ELEMENTARY SCHOOL1845 SOUTH SULTANA AVENUE | 4.6★ | None | 24 |
| 26 | ONTARIO CHRISTIAN PRESCHOOL/DAY CARE1907 SOUTH EUCLID AVENUE | 4.6★ | None | 150 |
| 27 | ONTARIO-MONTCLAIR YMCA - ELDERBERRY SCHOOL SITE950 N. ELDERBERRY | 4.6★ | None | 55 |
| 28 | ONTARIO-MONTCLAIR YMCA/MTN VIEW CHILD CARE SITE2825 EAST WALNUT STREET | 4.6★ | None | 45 |
| 29 | REDEEMER LUTHERAN PRESCHOOL920 W. 6TH STREET | 4.6★ | None | 66 |
| 30 | RODRIGUEZ FAMILY CHILD CARE | 4.6★ | None | 14 |
| 31 | ROSAS FAMILY CHILD CARE | 4.6★ | None | 14 |
| 32 | SANCHEZ FAMILY CHILD CARE | 4.6★ | None | 14 |
| 33 | SBCSS LEVI DICKEY STATE PRESCHOOL3840 SOUTH PARCO AVENUE | 4.6★ | None | 23 |
| 34 | SBCSS LIVE OAK STATE PRESCHOOL BLDG. C012547 EAST RIVERSIDE DRIVE | 4.6★ | None | 24 |
| 35 | SERNA FAMILY CHILD CARE | 4.6★ | None | 14 |
| 36 | SHALABI FAMILY CHILD CARE | 4.6★ | None | 14 |
| 37 | SINCLAIR FAMILY CHILD CARE | 4.6★ | None | 14 |
| 38 | TURCAZ FAMILY CHILD CARE | 4.6★ | None | 14 |
| 39 | WEE CARE LEARNING CENTER3876 LYTLE CREEK LOOP | 4.6★ | None | 18 |
| 40 | WEE CARE LEARNING CENTER3876 LYTLE CREEK LOOP | 4.6★ | None | 52 |
| 41 | LUNA FAMILY CHILD CARE | 4.6★ | None | 14 |
| 42 | GALVAN FAMILY CHILD CARE | 4.5★ | None | 14 |
| 43 | OMSD/MARIPOSA ELEMENTARY SCHOOL1605 E. D STREET | 4.5★ | None | 24 |
| 44 | SORIA FAMILY CHILD CARE | 4.5★ | None | 14 |
| 45 | SUNRISE CHILDREN'S CENTER2049 E RIVERSIDE DR | 4.5★ | None | 19 |
| 46 | SUNRISE CHILDREN'S CENTER2049 E RIVERSIDE DR | 4.5★ | None | 70 |
| 47 | ZICK FAMILY CHILD CARE | 4.5★ | None | 14 |
| 48 | ARCHIBALD RANCH CHRISTIAN PRESCHOOL13344 SOUTH ARCHIBALD AVENUE | 4.5★ | 1 | 111 |
| 49 | KINDERCARE LEARNING CENTER2140 SOUTH EUCLID AVENUE | 4.5★ | None | 24 |
| 50 | PSD/WESTMINSTER HEAD START720 N. SULTANA AVENUE | 4.5★ | 1 | 70 |
| 51 | WEE CARE LEARNING CENTER3876 LYTLE CREEK LOOP | 4.5★ | None | 52 |
| 52 | BRIGHT STAR MONTESSORI PRESCHOOL965 E. 6TH STREET | 4.4★ | None | 53 |
| 53 | EASTER SEALS CHILD DEVELOPMENT CENTER1102 WEST PHILLIPS STREET | 4.4★ | None | 110 |
| 54 | EASTER SEALS CHILD DEVELOPMENT CENTER1102 WEST PHILLIPS STREET | 4.4★ | None | 32 |
| 55 | GREEN FAMILY CHILD CARE | 4.4★ | None | 14 |
| 56 | MABINI FAMILY CHILD CARE | 4.4★ | None | 14 |
| 57 | NUNEZ FAMILY CHILD CARE | 4.4★ | None | 14 |
| 58 | OMSD/HAWTHORNE ELEMENTARY SCHOOL705 WEST HAWTHORNE STREET | 4.4★ | None | 24 |
| 59 | ONTARIO-MONTCLAIR YMCA RANCH VIEW3300 OLD RANCH VIEW RD | 4.4★ | None | 23 |
| 60 | ONTARIO-MONTCLAIR YMCA-CREEK VIEW SITE3742 LYTLE CREEK N LP | 4.4★ | None | 43 |
| 61 | SIRIWARDENA FAMILY CHILD CARE | 4.4★ | None | 14 |
| 62 | WANG FAMILY CHILD CARE | 4.4★ | None | 14 |
| 63 | YANG FAMILY CHILD CARE | 4.4★ | None | 14 |
| 64 | ZHONG FAMILY CHILD CARE | 4.4★ | None | 14 |
| 65 | ARGUMEDO FAMILY CHILD CARE | 4.4★ | None | 14 |
| 66 | SUNRISE CHILDREN'S CENTER2049 E RIVERSIDE DR | 4.4★ | None | 45 |
| 67 | GREEN FAMILY CHILD CARE | 4.3★ | None | 14 |
| 68 | ARAIZA FAMILY CHILD CARE | 4.3★ | 1 | 14 |
| 69 | LIL' BLUE HEARTWOOD PRESCHOOL2460 S EUCLID AVE | 4.3★ | 1 | 16 |
| 70 | LIL' BLUE HEARTWOOD PRESCHOOL2460 S EUCLID AVE | 4.3★ | None | 83 |
| 71 | KINDERCARE LEARNING CENTER2140 SOUTH EUCLID AVENUE | 4.3★ | None | 28 |
| 72 | PSD/ONTARIO HEAD START555 WEST MAPLE AVENUE | 4.3★ | None | 224 |
| 73 | TRUTH PRESCHOOL ACADEMY602 NORTH VIRGINIA AVENUE | 4.2★ | None | 60 |
| 74 | HEAVENLY CARE1030A E RIVERSIDE DRIVE | 4.1★ | 1 · 1 high-risk | 59 |
| 75 | CHILDREN'S MONTESSORI SCHOOL328 WEST PHILLIPS STREET | 4.1★ | None | 34 |