- Obstetricians & Gynecologists, Belvidere - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Belvidere
- Oil & Gas Producers, Belvidere - Companies
- Oil Change & Lubrication, Belvidere - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Belvidere - Oil Companies
- Oil Petroleum Wholesale, Belvidere
- Oil Refinery, Belvidere
- Open Bible Church, Belvidere
- Ophthalmologists, Belvidere - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Belvidere
- Opticians, Belvidere
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- Optometrists, Belvidere - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Belvidere
- Ornamental Nursery Services, Belvidere
- Orthodontist, Belvidere - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Belvidere
- Outdoor & Lawn & Garden Equipment Repair & Service, Belvidere
- Outdoor Equipment & Accessories, Belvidere
- Outdoor Furniture & Patio Furniture, Belvidere - Garden Furniture Stores
- Outsourcing Services, Belvidere
- Oxygen & Respiratory Equipment & Supplies, Belvidere - Oxygen Concentrator, Tank, Machine, etc
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