- Occupational Health Care Professionals, Apopka
- Occupational Therapy, Apopka - Occupational Health Specialists
- Office Buildings & Parks, Apopka
- Office Machines & Equipment Rental, Apopka
- Office Supplies, Equipment & Office Furniture Stores, Apopka
- Oil & Gas Companies, Apopka
- Oil & Petroleum Products, Apopka - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Apopka - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Apopka - Oil Companies
- Old Age Homes Service, Apopka
- Ophthalmologists, Apopka - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Apopka - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Apopka
- Opticians, Apopka
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- Optometrists, Apopka - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Apopka - Dentists - Oral & Maxillofacial Surgeons
- Orchid Growers, Apopka
- Oriental Goods & Products Stores, Apopka
- Ornamental Greenhouses, Apopka
- Ornamental Nursery, Apopka
- Ornamental Nursery Products, Apopka
- Ornamental Nursery Services, Apopka
- Orthopedic & Prosthetic Appliances & Shoes, Apopka - Orthopedic Shoes
- Other Building Materials & Supplies, Apopka
- Outdoor Equipment & Accessories, Apopka
- Overhead Door, Apopka
- Ownership Organizations, Apopka
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