| O Fallon CCSD 90, IL (District) |
| O Fallon Twp HSD 203, IL (District) |
| O'Donnell ISD, TX (District) |
| O'Neill Public Schools, NE (District) |
| Oak Bluffs, MA (District) |
| Oak Creek-Franklin Joint School District, WI (District) |
| Oak Grove, OK (District) |
| Oak Grove Elementary, CA (District) |
| Oak Grove R-Vi, MO (District) |
| Oak Grove SD 68 Bartonville, IL (District) |
| Oak Grove SD 68 Green Oaks, IL (District) |
| Oak Grove Union Elementary, CA (District) |
| Oak Harbor School District, WA (District) |
| Oak Hill Montessori Community School, MN (PSA) |
| Oak Hill R-I, MO (District) |
