- Obstetricians & Gynecologists, Belleville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Belleville
- Oil & Gas Additives & Supplies, Belleville
- Oil & Gas Land Leases Properties & Royalties, Belleville
- Oil Change & Lubrication, Belleville - Auto Oil & Quick Lube
- Ophthalmologists, Belleville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Belleville
- Opticians, Belleville
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- Optometrists, Belleville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oriental Goods & Products Stores, Belleville
- Orthopedists, Belleville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Belleville
- Other Lodging, Belleville
- Outdoor & Lawn & Garden Equipment Repair & Service, Belleville
- Outdoor Furniture & Patio Furniture, Belleville - Garden Furniture Stores
- Ownership Organizations, Belleville
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