- Office Supplies, Equipment & Office Furniture Stores, Jackson
- Oil & Petroleum Products, Jackson - Merchant, Wholesalers, etc
- Oil Industry & Oil Field Equipment & Services, Jackson - Oil Companies
- Oil Petroleum Wholesale, Jackson
- Open Bible Church, Jackson
- Ophthalmologists, Jackson - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Ornamental Greenhouses, Jackson
- Ornamental Nursery, Jackson
- Ornamental Nursery Products, Jackson
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