- Obstetricians & Gynecologists, Galesburg - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Galesburg
- Off Road Vehicles Parts & Accessories, Galesburg
- Office Buildings & Parks, Galesburg
- Office Supplies, Equipment & Office Furniture Stores, Galesburg
- Oil & Petroleum Products, Galesburg - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Galesburg - Auto Oil & Quick Lube
- Oilfield Trucking, Galesburg
- Oncologists, Galesburg - Cancer Doctors, Physicians & Surgeons (Oncology)
- Open Bible Church, Galesburg
- Ophthalmologists, Galesburg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Galesburg
- Opticians, Galesburg
- Optometrists, Galesburg - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Galesburg - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Galesburg
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- Ornamental Greenhouses, Galesburg
- Ornamental Nursery, Galesburg
- Ornamental Nursery Products, Galesburg
- Ornamental Nursery Services, Galesburg
- Orthodontist, Galesburg - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic Appliances, Galesburg
- Orthopedists, Galesburg - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Galesburg
- Outdoor & Lawn & Garden Equipment Repair & Service, Galesburg
- Outdoor Advertising & Billboard, Galesburg
- Outdoor Equipment & Accessories, Galesburg
- Outdoor Furniture & Patio Furniture, Galesburg - Garden Furniture Stores
- Outpatient Clinics, Galesburg - Care & Treatment Centers
- Outpatient Services, Galesburg - Outpatient Care
- Overhead Door, Galesburg
- Oxygen & Respiratory Equipment & Supplies, Galesburg - Oxygen Concentrator, Tank, Machine, etc
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