- Occupational Health Care Professionals, Gardnerville
- Occupational Therapy, Gardnerville - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Gardnerville
- Oil & Petroleum Products, Gardnerville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Gardnerville - Auto Oil & Quick Lube
- Optometrists, Gardnerville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Gardnerville - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Gardnerville
- Ornamental Iron - Residential, Gardnerville - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Gardnerville - Steel, Iron, Bronze, etc
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- Ornamental Nursery, Gardnerville
- Ornamental Nursery Products, Gardnerville
- Ornamental Nursery Services, Gardnerville
- Other Building Materials & Supplies, Gardnerville
- Other Lodging, Gardnerville
- Outdoor & Lawn & Garden Equipment Repair & Service, Gardnerville
- Outdoor Advertising & Billboard, Gardnerville
- Outdoor Equipment & Accessories, Gardnerville
- Oxygen & Respiratory Equipment & Supplies, Gardnerville - Oxygen Concentrator, Tank, Machine, etc
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