- Obstetricians & Gynecologists, Clayton - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Clayton - Occupational Medicine
- Occupational Health Care Professionals, Clayton
- Occupational Therapy, Clayton - Occupational Health Specialists
- Off Road Vehicles, Clayton
- Off Road Vehicles Parts & Accessories, Clayton
- Oil & Petroleum Products, Clayton - Merchant, Wholesalers, etc
- Oil & Petroleum Retail, Clayton
- Oil Change & Lubrication, Clayton - Auto Oil & Quick Lube
- Ophthalmologists, Clayton - Eye Doctors, Physicians & Surgeons (Ophthalmology)
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- Optometrists, Clayton - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Clayton
- Ornamental Nursery Services, Clayton
- Other Building Materials & Supplies, Clayton
- Other Lodging, Clayton
- Outdoor Centers, Clayton
- Outdoor Equipment & Accessories, Clayton
- Outdoor Power Equipment Repair, Clayton
- Outpatient Services, Clayton - Outpatient Care
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