- Occupational Health Care Professionals, Prairieville
- Occupational Therapy, Prairieville - Occupational Health Specialists
- Oil & Gas Hot Shot Services, Prairieville
- Oil & Gas Producers, Prairieville - Companies
- Oil Change & Lubrication, Prairieville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Prairieville - Oil Companies
- Ophthalmologists, Prairieville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Oral Surgeon, Prairieville - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Prairieville
- Ornamental Nursery Products, Prairieville
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- Ornamental Nursery Services, Prairieville
- Orthodontist, Prairieville - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Prairieville
- Other Electrical Products, Prairieville
- Other Industrial Contractors, Prairieville
- Outboard Motors, Prairieville
- Outboard Motors Parts & Repair, Prairieville
- Outdoor & Lawn & Garden Equipment Repair & Service, Prairieville
- Outdoor Equipment & Accessories, Prairieville
- Ownership Organizations, Prairieville
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