- Occupational Health Care Professionals, Alexandria
- Occupational Therapy, Alexandria - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Alexandria
- Oil Change & Lubrication, Alexandria - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Alexandria - Oil Companies
- Oil Petroleum Wholesale, Alexandria
- Oncologists, Alexandria - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Alexandria - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Alexandria
- Opticians, Alexandria
- Optometrists, Alexandria - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Alexandria - Dentists - Oral & Maxillofacial Surgeons
- Organizing Services & Products – Household & Business, Alexandria
- Ornamental Greenhouses, Alexandria
- Ornamental Nursery, Alexandria
- Ornamental Nursery Products, Alexandria
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- Ornamental Nursery Services, Alexandria
- Orthodontist, Alexandria - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Alexandria - Orthopedic Shoes
- Orthopedists, Alexandria - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Alexandria
- Other Attorneys & Lawyers, Alexandria
- Other Attorneys & Lawyers, Alexandria
- Other Building Materials & Supplies, Alexandria
- Other Lawyers & Attorneys, Alexandria
- Other Lodging, Alexandria
- Outboard Motors, Alexandria
- Outdoor & Lawn & Garden Equipment Repair & Service, Alexandria
- Outdoor Equipment & Accessories, Alexandria
- Outdoor Furniture & Patio Furniture, Alexandria - Garden Furniture Stores
- Overhead Door, Alexandria
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