- Obstetricians & Gynecologists, Petersburg - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Petersburg
- Oil & Petroleum Products, Petersburg - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Petersburg - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Petersburg - Oil Companies
- Oil Petroleum Wholesale, Petersburg
- Oncologists, Petersburg - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Petersburg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Petersburg - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Petersburg
- Opticians, Petersburg
- Optometrists, Petersburg - Eye Doctors, Physicians & Surgeons (Optometry)
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- Orchestras, Symphonies & Bands, Petersburg
- Organizing Services & Products – Household & Business, Petersburg
- Ornamental Nursery, Petersburg
- Ornamental Nursery Services, Petersburg
- Orthodontist, Petersburg - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Petersburg - Orthopedic Shoes
- Other Building Materials & Supplies, Petersburg
- Other Lodging, Petersburg
- Outdoor Equipment & Accessories, Petersburg
- Outerwear Stores, Petersburg - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Ownership Organizations, Petersburg
- Oxygen & Respiratory Equipment & Supplies, Petersburg - Oxygen Concentrator, Tank, Machine, etc
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