- Office Supplies, Equipment & Office Furniture Stores, Belleville
- Oil & Petroleum Products, Belleville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Belleville - Auto Oil & Quick Lube
- Oil Field Services Mud Disposal & Jacking, Belleville
- Oil Industry & Oil Field Equipment & Services, Belleville - Oil Companies
- Ophthalmologists, Belleville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Belleville
- Opticians, Belleville
- Optometrists, Belleville - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Greenhouses, Belleville
- Ornamental Nursery, Belleville
- Ornamental Nursery Services, Belleville
- Orthodontist, Belleville - Teeth Straightening, Invisalign & Dental Braces
- Osteoporosis Doctors, Belleville - Physicians & Surgeons
- Other Industrial Contractors, Belleville
- Outdoor Equipment & Accessories, Belleville
- Outdoor Furniture & Patio Furniture, Belleville - Garden Furniture Stores
- Ownership Organizations, Belleville
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