- Obstetricians & Gynecologists, Henrico - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Henrico
- Occupational Therapy, Henrico - Occupational Health Specialists
- Office Buildings & Parks, Henrico
- Office Partitions & Dividers, Henrico
- Office Supplies, Equipment & Office Furniture Stores, Henrico
- Oil & Gas Companies, Henrico
- Oil & Gas Producers, Henrico - Companies
- Oil Change & Lubrication, Henrico - Auto Oil & Quick Lube
- Oncologists, Henrico - Cancer Doctors, Physicians & Surgeons (Oncology)
- Opera Companies, Henrico
- Ophthalmologists, Henrico - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Henrico - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Henrico
- Opticians, Henrico
- Optometrists, Henrico - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Henrico - Eye Clinics
- Oral Surgeon, Henrico - Dentists - Oral & Maxillofacial Surgeons
- Organizations Equipment & Supplies, Henrico
- Organizing Consultants, Henrico
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- Organizing Services & Products – Household & Business, Henrico
- Organs Tuning & Repair, Henrico
- Ornamental Metal Work, Henrico - Steel, Iron, Bronze, etc
- Ornamental Nursery, Henrico
- Ornamental Nursery Products, Henrico
- Ornamental Nursery Services, Henrico
- Orthodontist, Henrico - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Henrico - Orthopedic Shoes
- Orthopedic Shoes, Henrico
- Orthopedists, Henrico - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Henrico
- Other Building Materials & Supplies, Henrico
- Other Lodging, Henrico
- Otolaryngologists, Henrico - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outdoor & Lawn & Garden Equipment Repair & Service, Henrico
- Outdoor Advertising & Billboard, Henrico
- Outdoor Equipment & Accessories, Henrico
- Outdoor Furniture & Patio Furniture, Henrico - Garden Furniture Stores
- Outpatient Services, Henrico - Outpatient Care
- Outsourcing Services, Henrico
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