- Obstetricians & Gynecologists, Jackson - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Jackson - Occupational Medicine
- Occupational Health Care Professionals, Jackson
- Occupational Medicine Doctors, Jackson - Physicians & Surgeons
- Occupational Therapy, Jackson - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Jackson
- Oil Field Contractors, Jackson
- Oil Industry & Oil Field Equipment & Services, Jackson - Oil Companies
- Ophthalmologists, Jackson - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Jackson
- Opticians, Jackson
- Optometrists, Jackson - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Jackson
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- Ornamental Nursery Services, Jackson
- Orthodontist, Jackson - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Jackson
- Orthopedic & Prosthetic Appliances & Shoes, Jackson - Orthopedic Shoes
- Other Attorneys & Lawyers, Jackson
- Other Attorneys & Lawyers, Jackson
- Other Building Materials & Supplies, Jackson
- Other Lawyers & Attorneys, Jackson
- Other Lodging, Jackson
- Outdoor & Lawn & Garden Equipment Repair & Service, Jackson
- Outdoor Equipment & Accessories, Jackson
- Ownership Organizations, Jackson
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