- Obstetricians & Gynecologists, Belleville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Belleville
- Occupational Health Care Physicians & Surgeons, Belleville - Occupational Medicine
- Occupational Health Care Professionals, Belleville
- Occupational Therapy, Belleville - Occupational Health Specialists
- Office & Meeting Equipment & Supplies Rental, Belleville
- Office Buildings & Parks, Belleville
- Office Furniture & Equipment Rental & Leasing, Belleville
- Office Supplies, Equipment & Office Furniture Stores, Belleville
- Oil & Gas Companies, Belleville
- Oil Change & Lubrication, Belleville - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Belleville
- Opticians, Belleville
- Optometrists, Belleville - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Belleville - Eye Clinics
- Oriental Massage, Belleville
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- Oriental Restaurants, Belleville
- Ornamental Nursery, Belleville
- Ornamental Nursery Services, Belleville
- Orthodontist, Belleville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Belleville - Orthopedic Shoes
- Orthopedic Appliances, Belleville
- Other Building Materials & Supplies, Belleville
- Other Electrical Products, Belleville
- Other Industrial Contractors, Belleville
- Outboard Motors, Belleville
- Outdoor Advertising & Billboard, Belleville
- Outdoor Equipment & Accessories, Belleville
- Outerwear & Accessories Manufacturers, Belleville
- Outerwear Stores, Belleville - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Belleville - Outpatient Care
- Overhead Door, Belleville
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