- Obstetricians & Gynecologists, Urbana - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Urbana
- Off Road Vehicles Parts & Accessories, Urbana
- Office Buildings & Parks, Urbana
- Office Supplies, Equipment & Office Furniture Stores, Urbana
- Oil Change & Lubrication, Urbana - Auto Oil & Quick Lube
- Old Age Homes Service, Urbana
- Oncologists, Urbana - Cancer Doctors, Physicians & Surgeons (Oncology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Urbana
- Opticians, Urbana
- Optometrists, Urbana - Eye Doctors, Physicians & Surgeons (Optometry)
- Organ Donation & Tissue Banks, Urbana
- Oriental Food Products, Urbana
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- Ornamental Metal Work, Urbana - Steel, Iron, Bronze, etc
- Ornamental Nursery, Urbana
- Ornamental Nursery Services, Urbana
- Orthopedic & Prosthetic Appliances & Shoes, Urbana - Orthopedic Shoes
- Orthopedists, Urbana - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Urbana
- Osteoporosis Doctors, Urbana - Physicians & Surgeons
- Other Building Materials & Supplies, Urbana
- Other Lodging, Urbana
- Outdoor Advertising & Billboard, Urbana
- Outdoor Equipment & Accessories, Urbana
- Outdoor Furniture & Patio Furniture, Urbana - Garden Furniture Stores
- Oxygen & Respiratory Equipment & Supplies, Urbana - Oxygen Concentrator, Tank, Machine, etc
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