| Harford Day School | 3.4 |
Regular elementary or secondary | Pre-KG-8 | 324 | 8.8 | Nonsectarian |
| Advent Lutheran Elementary School | 3.7 |
Regular elementary or secondary | KG-4 | 45 | 7.6 | Lutheran Church - Missouri Synod |
| Monarch Montessori School | 3.9 |
Montessori | Pre-KG-KG | 3 | 1.5 | Nonsectarian |
| The Monarch Montessori School | 3.9 |
Montessori | Pre-KG-KG | 3 | 1.5 | Nonsectarian |
| St Margaret School | 4.1 |
Regular elementary or secondary | Pre-KG-8 | 764 | 17.6 | Roman Catholic |
| Bel Forest Christian Academy | 4.6 |
Regular elementary or secondary | Pre-KG-8 | 57 | 9.7 | Baptist |
| Childrens Center Of N Harford | 5.9 |
Early childhood program/child care center | Pre-KG-KG | 3 | 3.0 | Nonsectarian |
| Harford Friends School | 5.9 |
Regular elementary or secondary | 6-8 | 19 | 3.8 | Friends |
| Highlands School The | 7.3 |
Regular elementary or secondary | 2-8 | 78 | 11.1 | Nonsectarian |
| Mountain Christian School | 9.1 |
Regular elementary or secondary | KG-8 | 302 | 12.3 | Christian (no specific denomination) |
| St Joan Of Arc School | 10.0 |
Regular elementary or secondary | KG-8 | 203 | 13.0 | Roman Catholic |
| Trinity Lutheran School | 10.9 |
Regular elementary or secondary | KG-8 | 267 | 11.2 | Evangelical Lutheran Church in America |
| Free State Montessori School | 11.0 |
Montessori | Pre-KG-8 | 36 | 8.8 | Nonsectarian |
| St Pauls Lutheran School | 11.1 |
Regular elementary or secondary | Pre-KG-8 | 148 | 14.4 | Lutheran Church - Missouri Synod |
| St John Evangelist Elem School | 11.2 |
Regular elementary or secondary | Pre-KG-8 | 235 | 11.0 | Roman Catholic |
| St Stephen Parochial School | 12.0 |
Regular elementary or secondary | Pre-KG-8 | 282 | 17.1 | Roman Catholic |
| Good Shepherd Catholic School | 13.5 |
Regular elementary or secondary | KG-8 | 175 | 12.6 | Roman Catholic |
| St James Academy | 13.5 |
Regular elementary or secondary | KG-8 | 356 | 6.0 | Episcopal |
| Montessori Manor | 13.7 |
Montessori | Pre-KG-2 | 8 | 3.1 | Nonsectarian |
| Susquehanna Adventist School | 13.7 |
Regular elementary or secondary | 1-6 | 9 | 9.0 | Seventh-Day Adventist |
| Trinity Church Day School | 14.4 |
Early childhood program/child care center | Pre-KG-KG | 10 | 6.7 | Episcopal |
| Heritage Montessori School | 15.1 |
Montessori | Pre-KG-5 | 30 | 6.8 | Nonsectarian |
| Tabernacle Christian School | 16.2 |
Regular elementary or secondary | Pre-KG-8 | 80 | 7.3 | Pentecostal |
| St Joseph School-fullerton | 17.3 |
Regular elementary or secondary | Pre-KG-8 | 480 | 17.2 | Roman Catholic |
| Villa Maria School At St Vincent's | 17.6 |
Special education | KG-6 | 51 | 4.2 | Nonsectarian |
| Epworth Childrens Center | 18.1 |
Early childhood program/child care center | Pre-KG-KG | 2 | 2.0 | Nonsectarian |
| Child City Day Care | 18.3 |
Early childhood program/child care center | Pre-KG-KG | 3 | 3.0 | Nonsectarian |
| Our Lady Of Grace | 18.4 |
Regular elementary or secondary | KG-8 | 177 | 14.3 | Roman Catholic |
| St Peters Christian Day School | 18.5 |
Regular elementary or secondary | Pre-KG-5 | 77 | 12.2 | Evangelical Lutheran Church in America |
| Bridges Montessori | 18.6 |
Montessori | Pre-KG-Trans. KG | 6 | 1.4 | Nonsectarian |
| Ashland Preschool Center | 18.7 |
Early childhood program/child care center | Pre-KG-KG | 11 | 11.0 | Presbyterian |
| Rock City Church Academy | 18.7 |
Regular elementary or secondary | Pre-KG-5 | 25 | 6.2 | Christian (no specific denomination) |
| Baltimore White Marsh Adventist School | 18.8 |
Regular elementary or secondary | 2-7 | 12 | 12.0 | Seventh-Day Adventist |
| Immaculate Heart Of Mary | 19.1 |
Regular elementary or secondary | Pre-KG-8 | 497 | 15.6 | Roman Catholic |
| Havenwood Church Preschool Center | 19.4 |
Early childhood program/child care center | Pre-KG-KG | 10 | 5.0 | Presbyterian |
| Apple Tree Children's Center | 19.5 |
Early childhood program/child care center | Pre-KG-KG | 10 | 5.0 | Nonsectarian |
| St Michael The Archangel School | 19.8 |
Regular elementary or secondary | Pre-KG-8 | 365 | 16.4 | Roman Catholic |
| Valley Baptist Kindergarten & Preschool | 19.9 |
Early childhood program/child care center | Pre-KG-KG | 8 | 8.0 | Baptist |
| St Paul's Nursery School & Kindergarten | 20.1 |
Early childhood program/child care center | Pre-KG-KG | 10 | 5.0 | Evangelical Lutheran Church in America |
| "gla Academy ""school Of Excellence""" | 20.2 |
Regular elementary or secondary | KG-8 | 31 | 6.2 | Christian (no specific denomination) |
| Immaculate Conception School | 20.2 |
Regular elementary or secondary | Pre-KG-8 | 502 | 14.6 | Roman Catholic |
| Our Lady Of Mt Carmel Elementary School | 20.3 |
Regular elementary or secondary | Pre-KG-8 | 467 | 13.6 | Roman Catholic |
| Calvary Lutheran School | 20.4 |
Regular elementary or secondary | Pre-KG-5 | 88 | 12.9 | Lutheran Church - Missouri Synod |
| Hamilton Christian Center | 20.4 |
Regular elementary or secondary | Pre-KG-4 | 35 | 4.0 | Assembly of God |
| St Stephens Christian Academy | 20.7 |
Regular elementary or secondary | KG-2 | 16 | 8.0 | Methodist |
| St Clare School | 21.0 |
Regular elementary or secondary | Pre-KG-8 | 216 | 12.6 | Roman Catholic |
| Ascension Lutheran Church Nursery School & Kdgn | 21.0 |
Early childhood program/child care center | Pre-KG-KG | 13 | 4.5 | Evangelical Lutheran Church in America |
| Bethlehem Christian Day School | 21.3 |
Regular elementary or secondary | Pre-KG-8 | 184 | 13.6 | Lutheran Church - Missouri Synod |
| Mt Pleasant Christian School | 21.4 |
Regular elementary or secondary | Pre-KG-7 | 109 | 12.4 | Christian (no specific denomination) |
| Dulaney Day School | 21.5 |
Early childhood program/child care center | Pre-KG-KG | 15 | 7.5 | Nonsectarian |
| Cathedral Christian Academy | 21.6 |
Regular elementary or secondary | Pre-KG-8 | 46 | 11.5 | Christian (no specific denomination) |
| St Clement Mary Hofbauer School | 21.6 |
Regular elementary or secondary | Pre-KG-8 | 302 | 14.7 | Roman Catholic |
| Zion Christian Middle School | 21.7 |
Regular elementary or secondary | 6-8 | 34 | 5.8 | Baptist |
| Mother Mary Lange Catholic School | 21.7 |
Regular elementary or secondary | Pre-KG-8 | 305 | 15.6 | Roman Catholic |
| St Pius X School | 21.7 |
Regular elementary or secondary | Pre-KG-8 | 342 | 14.2 | Roman Catholic |
| Good Shepherd School | 21.7 |
Early childhood program/child care center | Pre-KG-KG | 16 | 2.3 | Episcopal |
| Cardinal Shehan School | 21.9 |
Regular elementary or secondary | Pre-KG-8 | 311 | 22.2 | Roman Catholic |
| St Paul's Plus Preschool And Kindergarten | 22.0 |
Early childhood program/child care center | Pre-KG-KG | 10 | 1.7 | Episcopal |
| Dayspring Christian Academy | 22.0 |
Regular elementary or secondary | KG-7 | 63 | 6.9 | Christian (no specific denomination) |
| New Creation Christian Academy | 22.2 |
Early childhood program/child care center | Pre-KG-KG | 5 | 1.7 | Christian (no specific denomination) |
| Brown Memorial Weekday School | 22.3 |
Early childhood program/child care center | Pre-KG-KG | 20 | 9.5 | Presbyterian |
| The Montessori School | 22.3 |
Montessori | Pre-KG-6 | 165 | 7.7 | Nonsectarian |
| Miracle Baptist Christian School | 22.4 |
Regular elementary or secondary | Pre-KG-6 | 63 | 10.5 | Baptist |
| Govans Presbyterian Preschool | 22.4 |
Early childhood program/child care center | Pre-KG-KG | 14 | 14.0 | Presbyterian |
| St Mary Of The Assumption School | 22.6 |
Regular elementary or secondary | Pre-KG-8 | 135 | 12.3 | Roman Catholic |
| Dr Thomas L Stephens Academy Of Achievement | 22.7 |
Regular elementary or secondary | Pre-KG-4 | 8 | 4.0 | Nonsectarian |
| Academy Of Achievement | 22.7 |
Regular elementary or secondary | 1-4 | 8 | 4.0 | Nonsectarian |
| Church Of The Redeemer Day School | 22.8 |
Early childhood program/child care center | Pre-KG-Trans. 1 | 32 | 7.4 | Episcopal |
| St Francis Of Assisi School | 22.9 |
Regular elementary or secondary | Pre-KG-8 | 199 | 7.4 | Roman Catholic |
| Ivey League Learning Center | 23.0 |
Early childhood program/child care center | Pre-KG-KG | 10 | 10.0 | Nonsectarian |
| Grace United Methodist Preschool | 23.0 |
Early childhood program/child care center | Pre-KG-KG | 12 | 8.6 | Methodist |
| School Of The Cathedral Mary Our Queen | 23.1 |
Regular elementary or secondary | KG-8 | 437 | 11.7 | Roman Catholic |
| Gods Excellent Disciples Christian Academy | 23.2 |
Regular elementary or secondary | Pre-KG-8 | 25 | 6.2 | Other |
| A Child S Place | 23.4 |
Early childhood program/child care center | Pre-KG-KG | 16 | 5.7 | Roman Catholic |
| Baltimore Christian School | 23.5 |
Regular elementary or secondary | KG-5 | 87 | 11.4 | Presbyterian |
| Rabbi Benjamin Steinberg Middle School | 23.7 |
Regular elementary or secondary | 6-8 | 283 | 11.4 | Jewish |
| Shrine Of The Sacred Heart School | 23.8 |
Regular elementary or secondary | Pre-KG-8 | 167 | 12.1 | Roman Catholic |
| Hope Academy | 23.8 |
Regular elementary or secondary | Pre-KG-5 | 79 | 8.9 | Christian (no specific denomination) |
| Calvert School | 24.0 |
Regular elementary or secondary | Pre-KG-8 | 494 | 8.1 | Nonsectarian |
| First English Lutheran Preschool And Kindergarten | 24.0 |
Early childhood program/child care center | Pre-KG-KG | 8 | 5.7 | Evangelical Lutheran Church in America |
| St Davids Day School | 24.0 |
Early childhood program/child care center | Pre-KG-KG | 13 | 6.8 | Episcopal |
| Our Lady Of Fatima School | 24.1 |
Regular elementary or secondary | Pre-KG-8 | 133 | 10.8 | Roman Catholic |
| New Spiritual Foundation Edu-care Learning Center | 24.3 |
Regular elementary or secondary | Pre-KG-2 | 22 | 5.1 | Christian (no specific denomination) |
| Our Lady Of Hope St Luke School | 24.4 |
Regular elementary or secondary | Pre-KG-8 | 245 | 14.8 | Roman Catholic |
| Elmhurst Nursery School | 24.4 |
Early childhood program/child care center | Pre-KG-KG | 6 | 6.0 | Christian (no specific denomination) |
| St Katharine School | 24.5 |
Regular elementary or secondary | Pre-KG-8 | 250 | 13.7 | Roman Catholic |
| Sacred Heart Of Mary School | 24.6 |
Regular elementary or secondary | Pre-KG-8 | 169 | 9.1 | Roman Catholic |
| St Thomas Aquinas School | 24.6 |
Regular elementary or secondary | Pre-KG-8 | 176 | 14.1 | Roman Catholic |
| Archbishop Borders School | 24.9 |
Regular elementary or secondary | Pre-KG-8 | 159 | 12.4 | Roman Catholic |
