School District Abbreviations and Acronyms
- OPSOgallala Public Schools
- OPSOkomos Public Schools
- OPSOtsego Pbblic Schools
- OPSOsceola Public Schools
- OPSOsmond Public Schools
- OPSOverton Public Schools
- OPSOwasso Public Schools
- OPSOwosso Public Schools
- OPSOwensboro Public Schools
- OPSOxford Public Schools
- OPSBOrleans Parish School Board
- OPSBOuachita Parish School Board
- ORRSDOld Rochester Regional School District
- ORSDOuachita River School District
- OSOakland Schools
- OSDOceanside School Districr
- OSDOcosta School District
- OSDOdessa School District
- OSDOkanogan School District
- OSDOmak School District
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