- Obstetricians & Gynecologists, Winfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Winfield - Occupational Medicine
- Occupational Health Care Professionals, Winfield
- Oil & Gas Companies, Winfield
- Oil & Petroleum Products, Winfield - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Winfield
- Oil Change & Lubrication, Winfield - Auto Oil & Quick Lube
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- Oncologists, Winfield - Cancer Doctors, Physicians & Surgeons (Oncology)
- Optometrists, Winfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Winfield
- Ornamental Metal Work, Winfield - Steel, Iron, Bronze, etc
- Orthodontist, Winfield - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Winfield - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Winfield
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