- Obstetricians & Gynecologists, Belleville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Belleville - Occupational Medicine
- Occupational Health Care Professionals, Belleville
- Occupational Medicine Doctors, Belleville - Physicians & Surgeons
- Office Space on Rent, Belleville - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- 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
- Old Age Homes Service, Belleville
- Oncologists, Belleville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Belleville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Belleville
- Opticians, Belleville
- Optometrists, Belleville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Belleville - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Belleville
- Ornamental Greenhouses, Belleville
- Ornamental Nursery, Belleville
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- Ornamental Nursery Products, Belleville
- Ornamental Nursery Services, Belleville
- Orthodontist, Belleville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Belleville - Orthopedic Shoes
- Orthopedists, Belleville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Belleville
- Other Attorneys & Lawyers, Belleville
- Other Building Materials & Supplies, Belleville
- Other Lawyers & Attorneys, Belleville
- Other Lodging, Belleville
- Other Office Supply Stores, Belleville
- Outboard Motors, Belleville
- Outdoor & Lawn & Garden Equipment Repair & Service, Belleville
- Outdoor Advertising & Billboard, Belleville
- Outdoor Equipment & Accessories, Belleville
- Outdoor Furniture & Patio Furniture, Belleville - Garden Furniture Stores
- Outpatient Clinics, Belleville - Care & Treatment Centers
- Outpatient Services, Belleville - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Belleville - Oxygen Concentrator, Tank, Machine, etc
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