- Off Road Vehicles, Ridgeland
- Off Road Vehicles Parts & Accessories, Ridgeland
- Office Supplies, Equipment & Office Furniture Stores, Ridgeland
- Oil Industry & Oil Field Equipment & Services, Ridgeland - Oil Companies
- Oil Petroleum Wholesale, Ridgeland
- Open Door Church, Ridgeland
- Ophthalmologists, Ridgeland - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Ornamental Nursery, Ridgeland
- Ornamental Nursery Products, Ridgeland
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- Ornamental Nursery Services, Ridgeland
- Other Building Materials & Supplies, Ridgeland
- Other Lodging, Ridgeland
- Outdoor & Lawn & Garden Equipment Repair & Service, Ridgeland
- Outdoor Advertising & Billboard, Ridgeland
- Outdoor Equipment & Accessories, Ridgeland
- Outdoor Furniture, Ridgeland
- Outdoor Furniture & Patio Furniture, Ridgeland - Garden Furniture Stores
- Oxygen & Respiratory Equipment & Supplies, Ridgeland - Oxygen Concentrator, Tank, Machine, etc
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