- Obstetricians & Gynecologists, Midlothian - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Midlothian
- Occupational Therapy, Midlothian - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Midlothian
- Oil & Petroleum Products, Midlothian - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Midlothian - Auto Oil & Quick Lube
- Oncologists, Midlothian - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Midlothian - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Midlothian
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Midlothian
- Opticians, Midlothian
- Optometrists, Midlothian - Eye Doctors, Physicians & Surgeons (Optometry)
- Organ Donation & Tissue Banks, Midlothian
- Organizing Services & Products – Household & Business, Midlothian
- Oriental Rugs, Midlothian
- Ornamental Nursery, Midlothian
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- Ornamental Nursery Services, Midlothian
- Orthodontist, Midlothian - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Midlothian
- Orthopedists, Midlothian - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Midlothian
- Osteoporosis Doctors, Midlothian - Physicians & Surgeons
- Other Attorneys & Lawyers, Midlothian
- Other Attorneys & Lawyers, Midlothian
- Other Building Materials & Supplies, Midlothian
- Other Electrical Products, Midlothian
- Other Industrial Goods, Midlothian
- Other Lawyers & Attorneys, Midlothian
- Outdoor & Lawn & Garden Equipment Repair & Service, Midlothian
- Outdoor Advertising & Billboard, Midlothian
- Outdoor Equipment & Accessories, Midlothian
- Ownership Organizations, Midlothian
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