- Obstetricians & Gynecologists, Apex - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Apex
- Occupational Therapy, Apex - Occupational Health Specialists
- Off Road Vehicles, Apex
- Off Road Vehicles Parts & Accessories, Apex
- Office Supplies, Equipment & Office Furniture Stores, Apex
- Oil Change & Lubrication, Apex - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Apex - Oil Companies
- Oil Refinery, Apex
- Online Advertising, Apex - Internet Advertising
- Ophthalmologists, Apex - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optometrists, Apex - Eye Doctors, Physicians & Surgeons (Optometry)
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- Optometry Clinics, Apex - Eye Clinics
- Oral Surgeon, Apex - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Apex
- Ornamental Nursery Services, Apex
- Orthodontist, Apex - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Apex - Orthopedic Shoes
- Other Building Materials & Supplies, Apex
- Outdoor Equipment & Accessories, Apex
- Outdoor Furniture, Apex
- Outpatient Services, Apex - Outpatient Care
- Ownership Organizations, Apex
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