- Obstetricians & Gynecologists, Vicksburg - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Vicksburg - Occupational Medicine
- Occupational Health Care Professionals, Vicksburg
- Occupational Medicine Doctors, Vicksburg - Physicians & Surgeons
- Occupational Therapy, Vicksburg - Occupational Health Specialists
- Off Road Vehicles, Vicksburg
- Off Road Vehicles Parts & Accessories, Vicksburg
- Office Supplies, Equipment & Office Furniture Stores, Vicksburg
- Oil & Gas Exploration & Development, Vicksburg - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Producers, Vicksburg - Companies
- Oil & Petroleum Products, Vicksburg - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Vicksburg
- Oil Change & Lubrication, Vicksburg - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Vicksburg - Oil Companies
- Oil Petroleum Wholesale, Vicksburg
- Oil Refinery, Vicksburg
- Oncologists, Vicksburg - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Vicksburg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
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- Optical Stores - Eyeglasses, Lenses & Sunglasses, Vicksburg
- Opticians, Vicksburg
- Optometrists, Vicksburg - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Vicksburg - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Vicksburg
- Ornamental Nursery Services, Vicksburg
- Orthodox Churches, Vicksburg
- Orthopedists, Vicksburg - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Vicksburg
- Other Attorneys & Lawyers, Vicksburg
- Other Building Materials & Supplies, Vicksburg
- Other Industrial Goods, Vicksburg
- Other Lawyers & Attorneys, Vicksburg
- Other Lodging, Vicksburg
- Outdoor & Lawn & Garden Equipment Repair & Service, Vicksburg
- Outdoor Equipment & Accessories, Vicksburg
- Outpatient Services, Vicksburg - Outpatient Care
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