- Obstetricians & Gynecologists, Marysville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Marysville
- Oil And Petroleum Products, Marysville
- Oil Change & Lubrication, Marysville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Marysville - Oil Companies
- Oil Petroleum Wholesale, Marysville
- Oilfield Trucking, Marysville
- Old Age Homes Service, Marysville
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Marysville
- Opticians, Marysville
- Optometrists, Marysville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Marysville - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Marysville
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- Ornamental Nursery, Marysville
- Ornamental Nursery Products, Marysville
- Ornamental Nursery Services, Marysville
- Orthopedists, Marysville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Marysville
- Other Industrial Contractors, Marysville
- Outdoor Equipment & Accessories, Marysville
- Outdoor Furniture & Patio Furniture, Marysville - Garden Furniture Stores
- Outerwear Stores, Marysville - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Marysville - Outpatient Care
- Overhead Door, Marysville
- Oxygen & Respiratory Equipment & Supplies, Marysville - Oxygen Concentrator, Tank, Machine, etc
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