| New Life Christian School | 1.0 |
Regular elementary or secondary | KG-8 | 136 | 14.6 | Christian (no specific denomination) |
| Town And Country Day School | 1.7 |
Early childhood program/child care center | Pre-KG-KG | 16 | 6.7 | Nonsectarian |
| Bethany Child Care Center | 2.2 |
Early childhood program/child care center | Pre-KG-KG | 4 | 4.0 | Christian (no specific denomination) |
| Kindercare Learning Center | 3.0 |
Early childhood program/child care center | Pre-KG-KG | 8 | 8.0 | Nonsectarian |
| Childrens World Learning Center | 4.0 |
Early childhood program/child care center | Pre-KG-KG | 4 | 4.0 | Nonsectarian |
| Countryside Montessori Center | 4.2 |
Montessori | Pre-KG-1 | 24 | 12.0 | Nonsectarian |
| St Edward School | 4.2 |
Regular elementary or secondary | Pre-KG-8 | 425 | 19.3 | Roman Catholic |
| Montessori Academy Of Corona | 4.4 |
Montessori | Pre-KG-KG | 12 | 12.0 | Nonsectarian |
| Magnolia Preschool And Kindergarten | 4.7 |
Regular elementary or secondary | Pre-KG-1 | 15 | 15.0 | Nonsectarian |
| La Petite Academy | 4.8 |
Early childhood program/child care center | Pre-KG-KG | 14 | 14.0 | Nonsectarian |
| Learning Bee Montessori Academy | 5.1 |
Montessori | Pre-KG-1 | 17 | 2.4 | Nonsectarian |
| Learning Bee Montessori Academy | 5.1 |
Montessori | Pre-KG-4 | 9 | 2.0 | Nonsectarian |
| Grace Lutheran School | 5.3 |
Regular elementary or secondary | KG-8 | 75 | 13.6 | Lutheran Church - Missouri Synod |
| Cottonwood Montessori | 5.4 |
Montessori | Pre-KG-KG | 10 | 5.0 | Nonsectarian |
| Montessori School Of Corona | 5.6 |
Montessori | Pre-KG-8 | 123 | 12.3 | Nonsectarian |
| Childrens Montessori Center | 5.8 |
Montessori | Pre-KG-1 | 14 | 4.0 | Nonsectarian |
| Mulberry Childcare & Preschool | 5.8 |
Early childhood program/child care center | Pre-KG-KG | 9 | 9.0 | Nonsectarian |
| Montessori Childrens House | 5.9 |
Montessori | Pre-KG-2 | 17 | 5.7 | Nonsectarian |
| Crossroads Christian Schools | 6.1 |
Regular elementary or secondary | Pre-KG-8 | 547 | 22.3 | Christian (no specific denomination) |
| Kids Of America | 6.2 |
Montessori | KG-KG | 3 | 3.0 | Nonsectarian |
| La Petite Academy | 6.3 |
Early childhood program/child care center | Pre-KG-KG | 12 | 12.0 | Nonsectarian |
| Calvary Chapel Christian Academy | 6.4 |
Regular elementary or secondary | KG-6 | 54 | 13.5 | Other |
| Crosspoint Children's Center | 6.7 |
Early childhood program/child care center | Pre-KG-KG | 17 | 8.5 | Calvinist |
| Cottonwood Montessori | 7.1 |
Montessori | Pre-KG-KG | 15 | 7.5 | Nonsectarian |
| Harvest Christian School | 7.2 |
Regular elementary or secondary | Pre-KG-6 | 403 | 17.5 | Christian (no specific denomination) |
| Olive Branch Christian Academy | 7.4 |
Regular elementary or secondary | Pre-KG-8 | 155 | 15.3 | Christian (no specific denomination) |
| Riverside Christian Middle School | 7.7 |
Regular elementary or secondary | 6-8 | 234 | 18.6 | Christian (no specific denomination) |
| Kindercare Learning Center | 8.0 |
Early childhood program/child care center | Pre-KG-KG | 18 | 11.2 | Nonsectarian |
| Ontario Christian School | 8.7 |
Regular elementary or secondary | Pre-KG-8 | 894 | 14.4 | Calvinist |
| Kiddie Korner | 9.1 |
Early childhood program/child care center | Pre-KG-KG | 15 | 11.5 | Baptist |
| Riverside Montessori Academy | 9.4 |
Montessori | Pre-KG-4 | 40 | 13.3 | Nonsectarian |
| Montessori School Of Chino Hills | 9.4 |
Montessori | Pre-KG-1 | 12 | 6.0 | Nonsectarian |
| Ontario Progressive Montessori School | 9.4 |
Montessori | KG-1 | 17 | 5.7 | Nonsectarian |
| St Margaret Mary School | 9.4 |
Regular elementary or secondary | Pre-KG-8 | 275 | 21.5 | Roman Catholic |
| St Catherine Of Alexandria School | 9.5 |
Regular elementary or secondary | KG-8 | 321 | 19.0 | Roman Catholic |
| Countrywood Elementary School | 9.5 |
Regular elementary or secondary | Pre-KG-8 | 51 | 10.2 | Nonsectarian |
| Mount Zion Christian School | 9.7 |
Early childhood program/child care center | Pre-KG-KG | 8 | 4.0 | Christian (no specific denomination) |
| New Hope Christian Schools | 9.7 |
Regular elementary or secondary | Pre-KG-6 | 100 | 13.3 | Methodist |
| Christ Lutheran School & Daycare | 10.1 |
Early childhood program/child care center | Pre-KG-Trans. KG | 3 | 0.3 | Evangelical Lutheran Church in America |
| Life Christian Academy | 10.2 |
Regular elementary or secondary | Pre-KG-6 | 49 | 12.2 | Christian (no specific denomination) |
| Loving Savior Of The Hills Lutheran School | 10.3 |
Regular elementary or secondary | Pre-KG-8 | 178 | 15.3 | Lutheran Church - Missouri Synod |
| Montessori Academy | 10.3 |
Montessori | Pre-KG-3 | 21 | 10.5 | Nonsectarian |
| Cornerstone Christian School | 10.4 |
Regular elementary or secondary | Pre-KG-6 | 91 | 13.0 | Church of the Nazarene |
| St George Parish School | 10.4 |
Regular elementary or secondary | Pre-KG-8 | 242 | 19.2 | Roman Catholic |
| Chino Valley Christian Schools | 10.4 |
Regular elementary or secondary | Pre-KG-8 | 280 | 10.0 | Christian (no specific denomination) |
| Ontario Christian Academy | 10.6 |
Alternative/other | 1-5 | 4 | 4.0 | Christian (no specific denomination) |
| Hillview Acres School Inc | 10.7 |
Special education | 3-8 | 8 | 4.0 | Nonsectarian |
| Montessori School House | 10.8 |
Montessori | Pre-KG-1 | 16 | 5.7 | Nonsectarian |
| First United Methodist Preschool & Kindergarten | 10.8 |
Early childhood program/child care center | Pre-KG-KG | 8 | 5.7 | Methodist |
| Childtime Learning Center | 10.9 |
Early childhood program/child care center | Pre-KG-KG | 22 | 11.0 | Nonsectarian |
| Kids Club Llc | 11.0 |
Early childhood program/child care center | Pre-KG-KG | 13 | 2.2 | Nonsectarian |
| Good Earth Montessori School | 11.1 |
Montessori | Pre-KG-KG | 24 | 12.0 | Nonsectarian |
| Temple Beth El Child Development Center | 11.1 |
Early childhood program/child care center | Pre-KG-Trans. KG | 33 | 16.5 | Nonsectarian |
| St Francis De Sales School | 11.2 |
Regular elementary or secondary | Pre-KG-8 | 311 | 34.6 | Roman Catholic |
| St Francis Of Assisi School | 11.4 |
Regular elementary or secondary | Pre-KG-8 | 509 | 18.9 | Roman Catholic |
| Children's Montessori School | 11.4 |
Montessori | Pre-KG-3 | 18 | 3.3 | Nonsectarian |
| Hillsborough School | 11.5 |
Regular elementary or secondary | Pre-KG-8 | 125 | 8.9 | Nonsectarian |
| Immanuel Lutheran Schools | 11.6 |
Regular elementary or secondary | Pre-KG-6 | 118 | 13.7 | Lutheran Church - Missouri Synod |
| Chino Hills Christian School | 11.7 |
Regular elementary or secondary | KG-6 | 222 | 22.2 | Christian (no specific denomination) |
| Our Lady Of Lourdes School | 11.7 |
Regular elementary or secondary | KG-8 | 211 | 26.4 | Roman Catholic |
| Woodcrest Montessori Education Center | 11.8 |
Montessori | Pre-KG-KG | 4 | 2.0 | Nonsectarian |
| Redeemer Lutheran Christian School | 11.9 |
Regular elementary or secondary | KG-8 | 141 | 16.4 | Lutheran Church - Missouri Synod |
| Sacred Heart Parish School | 11.9 |
Regular elementary or secondary | KG-8 | 282 | 24.5 | Roman Catholic |
| Life Covenant Christian Academy | 11.9 |
Regular elementary or secondary | KG-8 | 54 | 13.2 | Christian (no specific denomination) |
| Montessori Child Development Center | 12.1 |
Montessori | Pre-KG-3 | 45 | 9.2 | Nonsectarian |
| Hawarden Hills Academy | 12.2 |
Special program emphasis | KG-8 | 378 | 19.5 | Nonsectarian |
| Mountain Green Preschool & Child Care | 12.3 |
Early childhood program/child care center | KG-Trans. KG | 54 | 18.6 | Methodist |
| Kinder Care Learning Center | 12.3 |
Early childhood program/child care center | Pre-KG-KG | 7 | 7.0 | Nonsectarian |
| St Joseph School | 12.5 |
Regular elementary or secondary | KG-8 | 341 | 24.7 | Roman Catholic |
| Pacific Christian School | 12.6 |
Regular elementary or secondary | KG-4 | 46 | 8.5 | Brethren |
| Water Of Life Christian School | 12.7 |
Regular elementary or secondary | Pre-KG-5 | 166 | 15.2 | Christian (no specific denomination) |
| Montclair Christian Elementary | 12.7 |
Regular elementary or secondary | Pre-KG-6 | 38 | 7.6 | Assembly of God |
| Montessori Academy | 12.7 |
Montessori | Pre-KG-6 | 9 | 3.0 | Nonsectarian |
| Jumpstart Learning Center Inc | 12.8 |
Early childhood program/child care center | Pre-KG-KG | 4 | 4.0 | Nonsectarian |
| Lacc Children's House | 13.0 |
Early childhood program/child care center | Pre-KG-KG | 1 | 1.0 | Other |
| International Montessori School | 13.0 |
Montessori | Pre-KG-5 | 29 | 4.2 | Nonsectarian |
| Taft Child Dev Centers | 13.2 |
Regular elementary or secondary | Pre-KG-6 | 38 | 12.7 | Nonsectarian |
| California Preschool & Kindergarten | 13.2 |
Early childhood program/child care center | Pre-KG-KG | 14 | 14.0 | Nonsectarian |
| St Madeleine School | 13.3 |
Regular elementary or secondary | KG-8 | 177 | 17.5 | Roman Catholic |
| Mountain View Christian Preschool & Kindergarten | 13.3 |
Early childhood program/child care center | KG-KG | 24 | 5.0 | Baptist |
| Kindercare | 13.3 |
Early childhood program/child care center | Pre-KG-KG | 12 | 6.3 | Nonsectarian |
| Riverside Garden School | 13.3 |
Regular elementary or secondary | KG-6 | 115 | 13.4 | Nonsectarian |
| Anaheim Hills Montessori | 13.3 |
Montessori | Pre-KG-5 | 70 | 11.7 | Nonsectarian |
| Islamic Academy Of Riverside | 13.4 |
Regular elementary or secondary | Pre-KG-8 | 46 | 6.6 | Islamic |
| Kindercare Learning Center | 13.4 |
Early childhood program/child care center | Pre-KG-KG | 8 | 8.0 | Nonsectarian |
| Serrano Heights Academy | 13.6 |
Montessori | Pre-KG-2 | 20 | 7.7 | Nonsectarian |
| Calvary Chapel Academy | 13.6 |
Regular elementary or secondary | Pre-KG-8 | 151 | 13.8 | Christian (no specific denomination) |
| Alta Loma Christian School | 13.6 |
Regular elementary or secondary | Pre-KG-8 | 195 | 19.5 | Brethren |
| Cross And Crown Lutheran School | 13.6 |
Regular elementary or secondary | KG-2 | 13 | 6.5 | Evangelical Lutheran Church in America |
| St Mark's Episcopal School | 13.6 |
Regular elementary or secondary | KG-8 | 177 | 12.0 | Episcopal |
| Montessori Academy Of Phillips Ranch | 13.7 |
Montessori | Pre-KG-KG | 6 | 2.3 | Nonsectarian |
| Rancho Heritage School | 13.7 |
Regular elementary or secondary | Pre-KG-5 | 61 | 10.2 | Nonsectarian |
| Peace In The Valley Academy | 13.7 |
Regular elementary or secondary | KG-8 | 39 | 13.4 | Christian (no specific denomination) |
| Carden Arbor View School | 13.8 |
Regular elementary or secondary | KG-8 | 175 | 10.5 | Nonsectarian |
| Children's School At Claremont Mckenna College | 13.9 |
Regular elementary or secondary | Pre-KG-3 | 25 | 6.2 | Nonsectarian |
| American Montessori Academy | 13.9 |
Montessori | Pre-KG-KG | 21 | 10.5 | Nonsectarian |
| Hephatha Lutheran School | 14.0 |
Regular elementary or secondary | Pre-KG-8 | 184 | 17.5 | Lutheran Church - Missouri Synod |
| Kiddie Academy | 14.3 |
Early childhood program/child care center | Pre-KG-KG | 10 | 5.3 | Nonsectarian |
| Apple Tree Learning Center | 14.3 |
Early childhood program/child care center | Pre-KG-KG | 9 | 8.2 | Christian (no specific denomination) |
| Our Lady Of The Assumption School | 14.4 |
Regular elementary or secondary | KG-8 | 469 | 21.2 | Roman Catholic |
| Calvary Christian School | 14.5 |
Regular elementary or secondary | Pre-KG-8 | 79 | 6.6 | Baptist |
| St Peter & St Paul School | 14.5 |
Early childhood program/child care center | Pre-KG-KG | 14 | 8.8 | Roman Catholic |
| Resurrection Academy | 14.5 |
Regular elementary or secondary | Pre-KG-8 | 201 | 19.0 | Roman Catholic |
| First Christian Church Child Dev Ctr | 14.6 |
Regular elementary or secondary | Pre-KG-2 | 15 | 15.0 | Christian (no specific denomination) |
| St Joseph Elementary School | 14.7 |
Regular elementary or secondary | KG-8 | 244 | 21.4 | Roman Catholic |
| Fairmont Private School | 14.8 |
Regular elementary or secondary | Pre-KG-8 | 490 | 14.7 | Nonsectarian |
| Friends Christian Elementary School | 14.8 |
Regular elementary or secondary | Pre-KG-8 | 914 | 22.9 | Friends |
| Foothill Country Day School | 15.0 |
Regular elementary or secondary | KG-8 | 180 | 8.8 | Nonsectarian |
| Yorba Linda Preschool & Kindergarten | 15.1 |
Early childhood program/child care center | Pre-KG-KG | 2 | 2.0 | Nonsectarian |
| Western Christian School | 15.2 |
Regular elementary or secondary | Pre-KG-8 | 384 | 14.2 | Christian (no specific denomination) |
| Village Montessori Academy | 15.3 |
Montessori | Pre-KG-KG | 26 | 13.0 | Nonsectarian |
| Integrity Christian School | 15.3 |
Early childhood program/child care center | KG-KG | 3 | 3.0 | Christian (no specific denomination) |
| Mt Calvary Lutheran School | 15.3 |
Regular elementary or secondary | Pre-KG-8 | 190 | 18.8 | Lutheran Church - Missouri Synod |
| Diamond Bar Montessori Academy | 15.4 |
Montessori | Pre-KG-3 | 9 | 1.0 | Nonsectarian |
| Salem Lutheran School | 15.4 |
Regular elementary or secondary | Pre-KG-8 | 440 | 20.5 | Lutheran Church - Missouri Synod |
| La Petite Academy | 15.6 |
Early childhood program/child care center | KG-Trans. KG | 30 | 30.0 | Nonsectarian |
| Hillsborough Private | 15.7 |
Early childhood program/child care center | KG-KG | 18 | 18.0 | Nonsectarian |
| Dbc Children's Center | 15.7 |
Early childhood program/child care center | Pre-KG-KG | 10 | 10.0 | Church of Christ |
| Pine Tree Preschool Montessor | 15.9 |
Montessori | Pre-KG-KG | 4 | 4.0 | Nonsectarian |
| Icc Community | 16.0 |
Regular elementary or secondary | KG-6 | 93 | 10.6 | Islamic |
| Heritage Oak Private School | 16.0 |
Regular elementary or secondary | Pre-KG-8 | 533 | 9.4 | Nonsectarian |
| St Catherine Of Siena School | 16.2 |
Regular elementary or secondary | Pre-KG-8 | 162 | 16.0 | Roman Catholic |
| Discovery Depot | 16.2 |
Early childhood program/child care center | Pre-KG-Trans. KG | 56 | 18.1 | Church of the Nazarene |
| Valley Fellowship Resource Center | 16.3 |
Regular elementary or secondary | 1-8 | 29 | 14.5 | Seventh-Day Adventist |
| Oakridge Private School | 16.3 |
Regular elementary or secondary | Pre-KG-8 | 262 | 13.2 | Nonsectarian |
| Little Friends Preschool & Kindergarten | 16.3 |
Early childhood program/child care center | Pre-KG-KG | 206 | 68.7 | Christian (no specific denomination) |
| Montessori School Of Diamond Bar | 16.5 |
Montessori | Pre-KG-KG | 12 | 4.3 | Nonsectarian |
| Kindercare | 16.7 |
Early childhood program/child care center | Pre-KG-Trans. KG | 12 | 12.0 | Nonsectarian |
| Diamond Canyon Christian Preschool | 16.7 |
Early childhood program/child care center | Pre-KG-KG | 30 | 6.2 | Christian (no specific denomination) |
| Trinity Lutheran Christian School | 16.8 |
Regular elementary or secondary | Pre-KG-8 | 178 | 16.2 | Other Lutheran |
| Discovery World Montessori | 17.0 |
Montessori | Pre-KG-2 | 25 | 25.0 | Nonsectarian |
| Kindercare Learning Center | 17.0 |
Early childhood program/child care center | KG-KG | 15 | 7.5 | Nonsectarian |
| La Purisima School | 17.3 |
Regular elementary or secondary | Pre-KG-8 | 244 | 14.5 | Roman Catholic |
| Bethany Christian Learning Center | 17.4 |
Early childhood program/child care center | Pre-KG-KG | 11 | 11.0 | Christian (no specific denomination) |
| Kindercare | 17.5 |
Regular elementary or secondary | Pre-KG-6 | 50 | 7.3 | Nonsectarian |
| Independence Christian School | 17.6 |
Regular elementary or secondary | Pre-KG-8 | 179 | 15.4 | Christian (no specific denomination) |
| The Cross Christian School | 17.7 |
Regular elementary or secondary | Pre-KG-3 | 51 | 4.7 | Christian (no specific denomination) |
| Tec-canal St Elementary School | 17.8 |
Special education | 1-8 | 88 | 8.0 | Nonsectarian |
| Walnut United Methodist Preschool | 17.8 |
Early childhood program/child care center | Pre-KG-KG | 12 | 6.0 | Methodist |
| St Paul's Lutheran School | 17.8 |
Regular elementary or secondary | Pre-KG-8 | 605 | 19.3 | Lutheran Church - Missouri Synod |
| Placentia Towne & Country Early Education Center | 17.9 |
Early childhood program/child care center | Pre-KG-KG | 12 | 12.0 | Nonsectarian |
| The Childrens House | 18.0 |
Early childhood program/child care center | Pre-KG-KG | 15 | 15.0 | Christian (no specific denomination) |
| Childrens Montessori Center Of Via Verde | 18.0 |
Montessori | Pre-KG-1 | 27 | 7.1 | Nonsectarian |
| St Joseph Elementary School | 18.1 |
Regular elementary or secondary | Pre-KG-8 | 273 | 21.0 | Roman Catholic |
| Brea Olinda Friends Christian School | 18.1 |
Regular elementary or secondary | Pre-KG-6 | 177 | 9.9 | Christian (no specific denomination) |
| June Bug Preschool | 18.1 |
Early childhood program/child care center | Pre-KG-KG | 2 | 2.0 | Nonsectarian |
| The Creek | 18.1 |
Early childhood program/child care center | Pre-KG-KG | 16 | 16.0 | Christian (no specific denomination) |
| Carden Heights Of Orange | 18.1 |
Regular elementary or secondary | KG-8 | 95 | 6.4 | Christian (no specific denomination) |
| Kid Junction | 18.2 |
Early childhood program/child care center | Pre-KG-KG | 16 | 8.0 | Christian (no specific denomination) |
| Prime Time School | 18.3 |
Early childhood program/child care center | Pre-KG-KG | 5 | 5.0 | Nonsectarian |
| Northwood Montessori Of Irvine | 18.3 |
Montessori | Pre-KG-1 | 56 | 11.2 | Nonsectarian |
| Montessori Schools Of Irvine | 18.3 |
Montessori | Pre-KG-1 | 50 | 12.2 | Nonsectarian |
| Fairway Education Center | 18.3 |
Early childhood program/child care center | Pre-KG-KG | 26 | 13.0 | Nonsectarian |
| The Prentice School | 18.4 |
Special education | Pre-KG-8 | 209 | 9.2 | Nonsectarian |
| Walnut Valley Montessori School | 18.4 |
Montessori | Pre-KG-6 | 28 | 8.0 | Nonsectarian |
| Hillside Montessori School | 18.4 |
Montessori | Pre-KG-KG | 13 | 3.2 | Nonsectarian |
| Foothill Montessori | 18.4 |
Montessori | Pre-KG-3 | 33 | 16.5 | Nonsectarian |
| Foothill Montessori School | 18.4 |
Montessori | Pre-KG-3 | 37 | 12.3 | Nonsectarian |
| Covenant Christian School | 18.6 |
Regular elementary or secondary | Pre-KG-8 | 118 | 9.0 | Presbyterian |
| St Norbert School | 18.6 |
Regular elementary or secondary | KG-8 | 293 | 25.3 | Roman Catholic |
| Foothill Montessori School Llc | 18.7 |
Montessori | Pre-KG-KG | 13 | 2.6 | Nonsectarian |
| Country Village Preschool | 18.7 |
Early childhood program/child care center | Pre-KG-Trans. KG | 26 | 26.0 | Nonsectarian |
| Fairmont Private School (edgewood Campus) | 18.7 |
Regular elementary or secondary | Pre-KG-8 | 297 | 12.1 | Nonsectarian |
| Valley Adventist Christian School | 18.7 |
Regular elementary or secondary | KG-8 | 41 | 13.7 | Seventh-Day Adventist |
| Kindercare Learning Center | 18.8 |
Early childhood program/child care center | Pre-KG-KG | 7 | 7.0 | Nonsectarian |
| Creekside Christian School | 18.8 |
Regular elementary or secondary | KG-8 | 82 | 7.1 | Christian (no specific denomination) |
| Rossier Park Elementary School | 19.0 |
Special education | 1-7 | 74 | 8.2 | Nonsectarian |
| Kandyland Academy | 19.0 |
Early childhood program/child care center | Pre-KG-Trans. 1 | 22 | 11.6 | Nonsectarian |
| Tutor Time Child Care/learning Center | 19.0 |
Early childhood program/child care center | Pre-KG-KG | 18 | 18.0 | Nonsectarian |
| Arrow Montessori School Of San | 19.1 |
Montessori | Pre-KG-8 | 106 | 10.1 | Nonsectarian |
| Sunnymead Montessori School | 19.1 |
Montessori | Pre-KG-1 | 19 | 9.5 | Nonsectarian |
| La Petite Academy | 19.1 |
Early childhood program/child care center | Pre-KG-KG | 14 | 14.0 | Nonsectarian |
| Grace Harbor Church School | 19.2 |
Regular elementary or secondary | Pre-KG-5 | 64 | 10.7 | Baptist |
| Kindergarten Ranch School | 19.2 |
Special program emphasis | Pre-KG-3 | 9 | 2.7 | Christian (no specific denomination) |
| Loma Linda Children's Center | 19.3 |
Early childhood program/child care center | Pre-KG-KG | 12 | 12.0 | Seventh-Day Adventist |
| Shepherd Of The Valley School | 19.3 |
Early childhood program/child care center | Pre-KG-KG | 12 | 12.0 | Lutheran Church - Missouri Synod |
| St Anthony School | 19.3 |
Regular elementary or secondary | KG-8 | 236 | 20.0 | Roman Catholic |
| Sonrise Christian School-san Dimas | 19.3 |
Regular elementary or secondary | Pre-KG-5 | 119 | 18.0 | Christian (no specific denomination) |
| Immanuel Lutheran School | 19.3 |
Regular elementary or secondary | Pre-KG-8 | 112 | 14.0 | Lutheran Church - Missouri Synod |
| St Stephen's Lutheran Pre School & Kindergarten | 19.4 |
Early childhood program/child care center | Pre-KG-KG | 5 | 8.3 | Lutheran Church - Missouri Synod |
| Red Hill Lutheran School | 19.5 |
Regular elementary or secondary | Pre-KG-8 | 287 | 16.6 | Evangelical Lutheran Church in America |
| Lycee International De Los Angeles - Orange County | 19.5 |
Special program emphasis | Pre-KG-5 | 113 | 14.1 | Nonsectarian |
| St Johns Lutheran School | 19.5 |
Regular elementary or secondary | Pre-KG-8 | 674 | 21.3 | Lutheran Church - Missouri Synod |
| Temple Beth Tikvah Early Childhood Learning Ctr | 19.6 |
Early childhood program/child care center | Pre-KG-KG | 11 | 11.0 | Jewish |
| Plumfield School | 19.7 |
Early childhood program/child care center | Pre-KG-Trans. KG | 18 | 18.0 | Nonsectarian |
| Kindercare Learning Centers Inc # 218 | 19.7 |
Early childhood program/child care center | Pre-KG-KG | 4 | 4.0 | Nonsectarian |
| Ivycrest Montessori Private School | 19.7 |
Montessori | Pre-KG-4 | 80 | 11.4 | Nonsectarian |
| St Juliana Falconieri School | 19.7 |
Regular elementary or secondary | KG-8 | 311 | 23.7 | Roman Catholic |
| St Angela Merici School | 19.7 |
Regular elementary or secondary | KG-8 | 304 | 19.9 | Roman Catholic |
| Edgewood Preprimary Academy | 19.8 |
Early childhood program/child care center | Pre-KG-Trans. KG | 17 | 3.0 | Nonsectarian |
| First Congregational School | 19.8 |
Early childhood program/child care center | Pre-KG-KG | 8 | 8.0 | Other |
| Moreno Valley Christian School | 19.9 |
Regular elementary or secondary | KG-8 | 144 | 14.4 | Baptist |
| Montessori Of Brea | 19.9 |
Montessori | Pre-KG-5 | 35 | 4.2 | Nonsectarian |
| West Covina Hills Adventist School | 19.9 |
Regular elementary or secondary | KG-8 | 54 | 12.6 | Seventh-Day Adventist |
| Christian Montessori Academy | 19.9 |
Montessori | Pre-KG-3 | 36 | 10.0 | Christian (no specific denomination) |
| Tutor Time Learning Center | 20.0 |
Early childhood program/child care center | Pre-KG-Trans. KG | 11 | 0.7 | Nonsectarian |
| Holy Family Cathedal School | 20.0 |
Regular elementary or secondary | Pre-KG-8 | 520 | 19.6 | Roman Catholic |
| American Montessori House | 20.0 |
Montessori | Pre-KG-KG | 6 | 6.0 | Nonsectarian |
| Newport Avenue Preschool And Kindergarten | 20.0 |
Early childhood program/child care center | KG-KG | 6 | 6.0 | Nonsectarian |
| Christ Lutheran School | 20.0 |
Regular elementary or secondary | Pre-KG-8 | 156 | 17.1 | Lutheran Church - Missouri Synod |
| Fullerton Christian Preschool | 20.1 |
Early childhood program/child care center | Pre-KG-KG | 12 | 2.5 | Christian (no specific denomination) |
| St Louise De Marillac School | 20.1 |
Regular elementary or secondary | KG-8 | 311 | 28.0 | Roman Catholic |
| Calvary Christian School | 20.1 |
Regular elementary or secondary | 1-8 | 492 | 15.4 | Christian (no specific denomination) |
| Cathys Kids Club | 20.2 |
Early childhood program/child care center | Pre-KG-KG | 8 | 8.0 | Nonsectarian |
| Montessori At The Park | 20.2 |
Early childhood program/child care center | Pre-KG-KG | 12 | 6.0 | Nonsectarian |
| Far Horizons Montessori | 20.2 |
Montessori | Pre-KG-8 | 129 | 10.8 | Nonsectarian |
| Montessori Child Care Center | 20.2 |
Montessori | Pre-KG-KG | 6 | 2.1 | Nonsectarian |
| True Love Luthern Church | 20.3 |
Regular elementary or secondary | 1-1 | 5 | 2.5 | Lutheran Church - Missouri Synod |
| St Anthony Claret Elem School | 20.3 |
Regular elementary or secondary | Pre-KG-8 | 229 | 16.8 | Roman Catholic |
| St John's Episcopal School | 20.4 |
Regular elementary or secondary | Pre-KG-8 | 642 | 15.8 | Episcopal |
| Sonrise Christian School | 20.4 |
Regular elementary or secondary | Pre-KG-8 | 464 | 19.9 | Church of Christ |
| Sonrise Christian School | 20.4 |
Regular elementary or secondary | KG-8 | 463 | 20.5 | Church of Christ |
| New Horizon Elementary School, Irvine | 20.4 |
Regular elementary or secondary | Pre-KG-6 | 149 | 5.3 | Islamic |
| Kids Cottage | 20.4 |
Alternative/other | Pre-KG-4 | 18 | 9.0 | Christian (no specific denomination) |
| Morasha Jewish Day School | 20.5 |
Regular elementary or secondary | Pre-KG-6 | 61 | 7.3 | Jewish |
| Grand Avenue Christian | 20.5 |
Regular elementary or secondary | Pre-KG-6 | 35 | 6.6 | Methodist |
| Kindercare Learning Centers Inc #743 | 20.5 |
Early childhood program/child care center | Pre-KG-KG | 6 | 6.0 | Nonsectarian |
| Chez Grand Mere Preschool | 20.5 |
Early childhood program/child care center | Pre-KG-KG | 11 | 11.0 | Nonsectarian |
| Covina Development Center | 20.5 |
Alternative/other | Pre-KG-KG | 12 | 6.0 | Nonsectarian |
| Providence Preschool | 20.5 |
Special education | Pre-KG-Trans. KG | 30 | 10.0 | Nonsectarian |
| American Future Learning Center | 20.6 |
Alternative/other | Pre-KG-5 | 39 | 24.4 | Nonsectarian |
| Tutor Time Child Care | 20.6 |
Early childhood program/child care center | Pre-KG-KG | 11 | 11.0 | Nonsectarian |
| Zion Lutheran School | 20.7 |
Regular elementary or secondary | KG-8 | 229 | 17.9 | Lutheran Church - Missouri Synod |
| Valley Christian School | 20.7 |
Early childhood program/child care center | Pre-KG-KG | 12 | 12.0 | Church of the Nazarene |
| Anaheim Preschool & Kinderten | 20.7 |
Early childhood program/child care center | Pre-KG-KG | 20 | 2.3 | Nonsectarian |
| Kindercare Learning Centers Inc # 1535 | 20.7 |
Early childhood program/child care center | Pre-KG-KG | 11 | 11.0 | Nonsectarian |
| St Jeanne De Lestonnac School | 20.7 |
Regular elementary or secondary | Pre-KG-8 | 418 | 17.5 | Roman Catholic |
| San Bernardino Christian School | 20.8 |
Regular elementary or secondary | KG-6 | 92 | 12.1 | Christian (no specific denomination) |
| St Dorothy Elementary School | 20.9 |
Regular elementary or secondary | KG-8 | 281 | 21.6 | Roman Catholic |
| Covina Gateway Montessori School | 20.9 |
Montessori | Pre-KG-KG | 2 | 2.0 | Nonsectarian |
| Holy Rosary Academy | 21.0 |
Regular elementary or secondary | KG-8 | 154 | 17.1 | Roman Catholic |
| Valley Christian Academy | 21.0 |
Regular elementary or secondary | Pre-KG-8 | 141 | 15.7 | Brethren |
| Ready Set Grow Preschool And Kindergarten | 21.0 |
Early childhood program/child care center | Pre-KG-KG | 10 | 10.0 | Nonsectarian |
| Gateway Montessori School | 21.0 |
Montessori | Pre-KG-KG | 9 | 4.5 | Nonsectarian |
| St Cecilia School | 21.0 |
Regular elementary or secondary | Pre-KG-8 | 298 | 15.4 | Roman Catholic |
| Mission Hills Christian School | 21.1 |
Regular elementary or secondary | KG-8 | 451 | 16.9 | Christian (no specific denomination) |
| Christ Lutheran School | 21.1 |
Regular elementary or secondary | Pre-KG-8 | 255 | 21.4 | Evangelical Lutheran Church in America |
| Montessori Of Rancho Santa Margarita | 21.1 |
Montessori | Pre-KG-Trans. 1 | 49 | 16.3 | Nonsectarian |
| Cumorah Academy | 21.1 |
Regular elementary or secondary | Pre-KG-1 | 8 | 8.0 | Nonsectarian |
| Berkeley School | 21.2 |
Special program emphasis | Pre-KG-5 | 41 | 8.4 | Nonsectarian |
| Discovery Montessori Preschool Kindergarten | 21.2 |
Montessori | Pre-KG-Trans. KG | 25 | 3.9 | Nonsectarian |
| Leport Schools - Mission Viejo | 21.3 |
Montessori | Pre-KG-8 | 47 | 5.0 | Nonsectarian |
| St Martha's School | 21.3 |
Regular elementary or secondary | 1-8 | 220 | 20.9 | Roman Catholic |
| Teddy Bear Tymes #2 | 21.4 |
Early childhood program/child care center | Pre-KG-KG | 8 | 4.0 | Nonsectarian |
| Woodcrest Preschool | 21.4 |
Early childhood program/child care center | Pre-KG-KG | 12 | 6.3 | Nonsectarian |
| Hope Lutheran Elem School | 21.4 |
Regular elementary or secondary | Pre-KG-8 | 139 | 8.7 | Lutheran Church - Missouri Synod |
| First Baptist Preschool | 21.4 |
Early childhood program/child care center | Pre-KG-Trans. KG | 23 | 1.8 | Baptist |
| Sacred Heart Elementary School | 21.4 |
Regular elementary or secondary | KG-8 | 294 | 17.7 | Roman Catholic |
| Covina Christian Preschool | 21.5 |
Early childhood program/child care center | Pre-KG-KG | 11 | 4.8 | Assembly of God |
| St Joseph Elementary School | 21.5 |
Regular elementary or secondary | KG-8 | 241 | 24.1 | Roman Catholic |
