- Obstetricians & Gynecologists, South Windsor - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, South Windsor
- Occupational Health Care Physicians & Surgeons, South Windsor - Occupational Medicine
- Occupational Health Care Professionals, South Windsor
- Occupational Medicine Doctors, South Windsor - Physicians & Surgeons
- Office Supplies, Equipment & Office Furniture Stores, South Windsor
- Oil Change & Lubrication, South Windsor - Auto Oil & Quick Lube
- Old Age Homes Service, South Windsor
- Ophthalmic Goods, South Windsor
- Ophthalmic Instruments & Machinery, South Windsor
- Optical Goods Manufacturers, South Windsor
- Optical Stores - Eyeglasses, Lenses & Sunglasses, South Windsor
- Opticians, South Windsor
- Optometrists, South Windsor - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, South Windsor - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, South Windsor
- Ornamental Nursery, South Windsor
- Ornamental Nursery Services, South Windsor
- Orthopedists, South Windsor - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, South Windsor
- Other Attorneys & Lawyers, South Windsor
- Other Building Materials & Supplies, South Windsor
- Other Lawyers & Attorneys, South Windsor
- Outdoor & Lawn & Garden Equipment Repair & Service, South Windsor
- Outdoor Centers, South Windsor
- Outdoor Equipment & Accessories, South Windsor
- Outdoor Furniture & Patio Furniture, South Windsor - Garden Furniture Stores
- Outdoor Power Equipment Repair, South Windsor
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