Businesses beginning with O
- O'Kelley Heating & Air Inc
- Oasis Custom Homes, Inc.
- Old Colony Furniture Company
- Oldcastle Surfaces, Inc
- OnDuty SC, Inc.
- One Hour Air Conditioning & Heating
- Open Bible Institute, LLC
- Operation Drains of the Upstate, Inc
- Orkin Exterminating Company Inc
- Ostheim Financial Group Inc.
- Over The Top Home Improvements
- Overhead Door Company of Greenville Inc