- Obstetricians & Gynecologists, Winfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Winfield
- Occupational Health Care Professionals, Winfield
- Office Supplies, Equipment & Office Furniture Stores, Winfield
- Oil & Gas Exploration & Development, Winfield - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Producers, Winfield - Companies
- Oil & Petroleum Products, Winfield - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Winfield
- Oil Change & Lubrication, Winfield - Auto Oil & Quick Lube
- Oil Field Contractors, Winfield
- Oil Industry & Oil Field Equipment & Services, Winfield - Oil Companies
- Old Age Homes Service, Winfield
- Oncologists, Winfield - Cancer Doctors, Physicians & Surgeons (Oncology)
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- Ophthalmologists, Winfield - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Winfield
- Optometrists, Winfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Winfield
- Ornamental Nursery Services, Winfield
- Orthopedic & Prosthetic Appliances & Shoes, Winfield - Orthopedic Shoes
- Other Electrical Products, Winfield
- Other Lodging, Winfield
- Outdoor & Lawn & Garden Equipment Repair & Service, Winfield
- Outdoor Advertising & Billboard, Winfield
- Outdoor Equipment & Accessories, Winfield
- Overhead Door, Winfield
- Oxygen & Respiratory Equipment & Supplies, Winfield - Oxygen Concentrator, Tank, Machine, etc
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