- Office Buildings & Parks, Redford
- Office Supplies, Equipment & Office Furniture Stores, Redford
- Oil & Gas Companies, Redford
- Oil Change & Lubrication, Redford - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Redford - Oil Companies
- Oil Petroleum Wholesale, Redford
- Ophthalmic Goods, Redford
- Ophthalmic Instruments & Machinery, Redford
- Ornamental Nursery, Redford
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