| OYSTER BAY HIGH SCHOOL | OYSTER BAY | Public school | 9–12 | 0 |
| OXHEAD ROAD SCHOOL | CENTEREACH | Public school | 1–5 | 0 |
| OXFORD ACADEMY PRIMARY SCHOOL | OXFORD | Public school | PK–4 | 0 |
| OXFORD ACADEMY MIDDLE SCHOOL | OXFORD | Public school | 5–8 | 0 |
| OXFORD ACADEMY HIGH SCHOOL | OXFORD | Public school | 9–12 | 0 |
| OWEN D YOUNG CENTRAL SCHOOL | VAN HORNESVILLE | Public school | K–12 | 0 |
| OWEGO FREE ACADEMY | OWEGO | Public school | 9–12 | 0 |
| OWEGO ELEMENTARY SCHOOL | OWEGO | Public school | PK–5 | 0 |
| OWEGO-APALACHIN MIDDLE SCHOOL | OWEGO | Public school | 6–8 | 0 |
| OWASCO ELEMENTARY SCHOOL | AUBURN | Public school | K–6 | 0 |
| OVERLOOK PRIMARY SCHOOL | POUGHKEEPSIE | Public school | K–2 | 0 |
| Over The Moon | Pine Bush | Private school | PK–2 | 0 |
| OUR WORLD NEIGHBORHOOD CHARTER SCHOOL 3 | CORONA | Public school | K–4 | 0 |
| OUR WORLD NEIGHBORHOOD CHARTER SCHOOL 2 | HOWARD BEACH | Public school | K–5 | 0 |
| OUR WORLD NEIGHBORHOOD CHARTER SCHOOL | ASTORIA | Public school | K–8 | 0 |
| Our World Montessori | Niskayuna | Private school | PK–K | 0 |
| Our Saviour Lutheran School | Bronx | Private school | 8–11 | 0 |
| Our Savior's Christian School | Albany | Private school | K–8 | 0 |
| Our Savior New American School | Centereach | Private school | PK–12 | 0 |
| Our Lady Queen Of Martyrs Catholic Academy | Forest Hills | Private school | K–8 | 0 |
| Our Lady Queen Of Martyrs Catholic Academy | Forest Hills | Private school | PK–8 | 0 |
| Our Lady Queen Of Martyrs | New York | Private school | PK–8 | 0 |
| Our Lady Queen Of Apostles Reg Catholic School | Center Moriches | Private school | PK–8 | 0 |
| Our Lady Of Victory School | Mount Vernon | Private school | PK–8 | 0 |
| Our Lady Of Victory School | Floral Park | Private school | PK–8 | 0 |
| Our Lady Of Victory School | Lackawanna | Private school | PK–8 | 0 |
| Our Lady Of The Snows Catholic Academy | Floral Park | Private school | PK–8 | 0 |
| Our Lady Of The Hamptons Regional Catholic School | Southampton | Private school | PK–8 | 0 |
| Our Lady Of The Blessed Sacrament School | Depew | Private school | PK–8 | 0 |
| Our Lady Of The Blessed Sacrament | Bayside | Private school | PK–8 | 0 |
| Our Lady Of Sorrows School | White Plains | Private school | K–8 | 0 |
| Our Lady Of Sorrows Catholic Academy | Corona | Private school | PK–8 | 0 |
| Our Lady Of Refuge School | Bronx | Private school | PK–8 | 0 |
| Our Lady Of Perpetual Help Catholic Academy Of Bro | Brooklyn | Private school | PK–8 | 0 |
| Our Lady Of Perpetual Help Catholic Academy | South Ozone Park | Private school | PK–8 | 0 |
| Our Lady Of Mt Carmel School | Bronx | Private school | PK–8 | 0 |
| Our Lady Of Mount Carmel School | Elmsford | Private school | PK–8 | 0 |
| Our Lady Of Mount Carmel School | Middletown | Private school | PK–8 | 0 |
| Our Lady Of Mercy School For Young Women | Rochester | Private school | 6–12 | 0 |
| Our Lady Of Mercy Academy | Syosset | Private school | 9–12 | 0 |
| Our Lady Of Lourdes School | New York | Private school | PK–5 | 0 |
| Our Lady Of Lourdes School | Malverne | Private school | PK–8 | 0 |
| Our Lady Of Hope Catholic Academy | Middle Village | Private school | PK–8 | 0 |
| Our Lady Of Guadalupe East | Central Islip | Private school | PK–4 | 0 |
| Our Lady Of Grace School | Bronx | Private school | PK–8 | 0 |
| Our Lady Of Grace Montessori School | Manhasset | Private school | PK–4 | 0 |
| Our Lady Of Grace Catholic Academy | Brooklyn | Private school | PK–8 | 0 |
| Our Lady Of Good Counsel | Staten Island | Private school | PK–8 | 0 |
| Our Lady Of Fatima School | East Elmhurst | Private school | PK–8 | 0 |
| Our Kids Place Country Day | Hewlett | Private school | PK–K | 0 |