- Obstetricians & Gynecologists, Alexandria - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Alexandria
- Occupational Health Care Professionals, Alexandria
- Occupational Therapy, Alexandria - Occupational Health Specialists
- Off Road Vehicles, Alexandria
- Off Road Vehicles Parts & Accessories, Alexandria
- Office Buildings & Parks, Alexandria
- Office Equipment & Supplies Manufacturers, Alexandria
- Office Planning & Design, Alexandria
- Office Space on Rent, Alexandria - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Alexandria
- Oil & Gas Exploration & Development, Alexandria - Oil Field Exploration, Monitoring & Remediation
- Oil & Petroleum Products, Alexandria - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Alexandria
- Oil Change & Lubrication, Alexandria - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Alexandria - Oil Companies
- Oil Refiners, Alexandria
- Oils Recycling, Alexandria
- Oncologists, Alexandria - Cancer Doctors, Physicians & Surgeons (Oncology)
- Online Advertising, Alexandria - Internet Advertising
- Ophthalmologists, Alexandria - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Opinion Analysis & Research, Alexandria
- Optical Goods Repair & Service, Alexandria - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Alexandria
- Opticians, Alexandria
- Optometrists, Alexandria - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Alexandria - Eye Clinics
- Oral Surgeon, Alexandria - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Alexandria
- Organ Donation & Tissue Banks, Alexandria
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- Organizing Services & Products – Household & Business, Alexandria
- Oriental Restaurants, Alexandria
- Oriental Rugs, Alexandria
- Ornamental Iron Work, Alexandria
- Ornamental Metal Work, Alexandria - Steel, Iron, Bronze, etc
- Ornamental Nursery, Alexandria
- Ornamental Nursery Products, Alexandria
- Ornamental Nursery Services, Alexandria
- Orthodontist, Alexandria - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Alexandria
- Orthodox Synagogues, Alexandria
- Orthopedic & Prosthetic Appliances & Shoes, Alexandria - Orthopedic Shoes
- Orthopedic Shoes, Alexandria
- Orthopedists, Alexandria - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Alexandria
- Osteoporosis Doctors, Alexandria - Physicians & Surgeons
- Other Attorneys & Lawyers, Alexandria
- Other Attorneys & Lawyers, Alexandria
- Other Building Materials & Supplies, Alexandria
- Other Industrial Contractors, Alexandria
- Other Lawyers & Attorneys, Alexandria
- Other Lodging, Alexandria
- Outdoor & Lawn & Garden Equipment Repair & Service, Alexandria
- Outdoor Advertising & Billboard, Alexandria
- Outdoor Equipment & Accessories, Alexandria
- Outerwear Stores, Alexandria - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Alexandria - Outpatient Care
- Outsourcing Services, Alexandria
- Ownership Organizations, Alexandria
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