- Obstetricians & Gynecologists, Charlottesville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Charlottesville - Occupational Medicine
- Occupational Health Care Professionals, Charlottesville
- Occupational Medicine Doctors, Charlottesville - Physicians & Surgeons
- Occupational Therapy, Charlottesville - Occupational Health Specialists
- Office Buildings & Parks, Charlottesville
- Office Equipment & Supplies Manufacturers, Charlottesville
- Office Machines & Equipment Rental, Charlottesville
- Office Supplies, Equipment & Office Furniture Stores, Charlottesville
- Oil & Gas Companies, Charlottesville
- Oil & Gas Exploration & Development, Charlottesville - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Producers, Charlottesville - Companies
- Oil & Petroleum Products, Charlottesville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Charlottesville - Auto Oil & Quick Lube
- Oil Field Supplies Rental, Charlottesville
- Oil Industry & Oil Field Equipment & Services, Charlottesville - Oil Companies
- Oil Petroleum Wholesale, Charlottesville
- Oil Well Cementing, Charlottesville
- Oil Well Core Analysis, Charlottesville
- Oncologists, Charlottesville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Online Advertising, Charlottesville - Internet Advertising
- Ophthalmologists, Charlottesville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Charlottesville - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Charlottesville
- Opticians, Charlottesville
- Optometrists, Charlottesville - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Charlottesville - Eye Clinics
- Oral Surgeon, Charlottesville - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Charlottesville
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- Organ Donation & Tissue Banks, Charlottesville
- Organizing Services & Products – Household & Business, Charlottesville
- Oriental Restaurants, Charlottesville
- Oriental Rugs, Charlottesville
- Ornamental Greenhouses, Charlottesville
- Ornamental Nursery, Charlottesville
- Ornamental Nursery Services, Charlottesville
- Orthodontist, Charlottesville - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Charlottesville
- Orthopedic & Prosthetic Appliances & Shoes, Charlottesville - Orthopedic Shoes
- Orthopedists, Charlottesville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Charlottesville
- Other Attorneys & Lawyers, Charlottesville
- Other Attorneys & Lawyers, Charlottesville
- Other Building Materials & Supplies, Charlottesville
- Other Electrical Products, Charlottesville
- Other Lawyers & Attorneys, Charlottesville
- Other Lodging, Charlottesville
- Other Office Supply Stores, Charlottesville
- Outdoor & Lawn & Garden Equipment Repair & Service, Charlottesville
- Outdoor Centers, Charlottesville
- Outdoor Equipment & Accessories, Charlottesville
- Outdoor Furniture & Patio Furniture, Charlottesville - Garden Furniture Stores
- Outdoor Power Equipment, Charlottesville
- Outerwear Stores, Charlottesville - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Charlottesville - Outpatient Care
- Overhead Door, Charlottesville
- Ownership Organizations, Charlottesville
- Oxygen & Respiratory Equipment & Supplies, Charlottesville - Oxygen Concentrator, Tank, Machine, etc
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