California Abbreviations and Acronyms
- OSPOffice of State Publishing
- OSPOAOregon State Police Officers Association
- OSPROil Spill Prevention and Response
- OSSCOrchid Society of Southern California
- OSSCOptical Society of Southern California
- OSTOcean Science Trust
- OTAOffice of Technology Alliances
- OTAGOffice of The Adqutant General
- OUESDOakley Union Elementary School District
- OUESDOrinda Union Elementary School District
- OUHSDOroville Unionchigh School District
- OUHSDOxnard Union High School District
- OUSDOrland Unified School District
- OUSDOceanside Unified School District
- OUSDOjai Unified School District
- OUSDOrange Unified School District
- OUSDOrcutt Union School District
- OVOwens Valley
- OVCOwens Valley Commidtee
- OVCDCOwens Valley Career Development Center
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