- Occupational Health Care Professionals, Winter Springs
- Occupational Therapy, Winter Springs - Occupational Health Specialists
- Office Buildings & Parks, Winter Springs
- Office Supplies, Equipment & Office Furniture Stores, Winter Springs
- Oil Change & Lubrication, Winter Springs - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Winter Springs - Oil Companies
- Old Age Homes Service, Winter Springs
- Ophthalmologists, Winter Springs - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Winter Springs - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Winter Springs
- Opticians, Winter Springs
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- Optometrists, Winter Springs - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Winter Springs - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Winter Springs
- Ornamental Nursery, Winter Springs
- Ornamental Nursery Services, Winter Springs
- Orthodontist, Winter Springs - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Winter Springs
- Outdoor & Lawn & Garden Equipment Repair & Service, Winter Springs
- Outdoor Equipment & Accessories, Winter Springs
- Outdoor Furniture & Patio Furniture, Winter Springs - Garden Furniture Stores
- Ownership Organizations, Winter Springs
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