Alphabetical company index for letter/character "O", page 12 of 22
- Onondaga County
- OnPAC Energy
- OnPoint Consulting
- Onslow County
- Onslow County Schools
- Onslow Memorial Hospital
- Onsted Community Schools
- Onstream Media Corp.
- Ontario County
- Ontario Local School District
- Ontario School District 8C
- Ontario-Montclair School District
- Onteora Central School District
- Ontonagon Area School District
- Ontonagon County
- Onvia Inc.
- Onyx Pharmaceuticals Inc.
- Oologah-Talala School District
- Ooma
- Oostburg School District
- Opdyke-Belle-Rive CCSD 5
- Opelika City School District
- Opelousas General Health System
- Open Range Energy Corp
- Open Solutions
- Open Systems Technologies
- Open Text Corp.
- Open Text Corporation
- OpenAir
- Openlane
- OpenLink Financial
- OpenTV Corp.
- Openwave Systems Inc.
- Operational Technologies
- Operative
- Opexa Therapeutics Inc.
- OpGen Inc.
- Opheim K-12 Schools
- Ophthotech Corp.
- Opko Health Inc.