- Occupational Health & Safety, Beloit
- Occupational Health Care Physicians & Surgeons, Beloit - Occupational Medicine
- Occupational Health Care Professionals, Beloit
- Occupational Medicine Doctors, Beloit - Physicians & Surgeons
- Occupational Therapy, Beloit - Occupational Health Specialists
- Off Road Vehicles, Beloit
- Off Road Vehicles Parts & Accessories, Beloit
- Office Buildings & Parks, Beloit
- Office Supplies, Equipment & Office Furniture Stores, Beloit
- Oil Change & Lubrication, Beloit - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Beloit - Oil Companies
- Oils Industrial, Beloit
- Open Bible Church, Beloit
- Ophthalmologists, Beloit - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Beloit
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- Opticians, Beloit
- Optometrists, Beloit - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Beloit - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Beloit
- Ornamental Nursery, Beloit
- Ornamental Nursery Services, Beloit
- Orthodontist, Beloit - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Beloit - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Beloit
- Other Building Materials & Supplies, Beloit
- Other Lodging, Beloit
- Outboard Motors Parts & Repair, Beloit
- Outdoor Equipment & Accessories, Beloit
- Outpatient Clinics, Beloit - Care & Treatment Centers
- Oxygen & Respiratory Equipment & Supplies, Beloit - Oxygen Concentrator, Tank, Machine, etc
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