- Obstetricians & Gynecologists, Seymour - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Seymour
- Occupational Therapy, Seymour - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Seymour
- Oil & Gas Consultants, Seymour
- Oil & Petroleum Products, Seymour - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Seymour - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Seymour - Oil Companies
- Oil Petroleum Wholesale, Seymour
- Ophthalmologists, Seymour - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Seymour
- Opticians, Seymour
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- Optometrists, Seymour - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Seymour - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Metal Work, Seymour - Steel, Iron, Bronze, etc
- Orthodontist, Seymour - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Seymour - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Seymour
- Other Building Materials & Supplies, Seymour
- Other Lodging, Seymour
- Outdoor & Lawn & Garden Equipment Repair & Service, Seymour
- Outdoor Equipment & Accessories, Seymour
- Overhead Door, Seymour
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