- Obstetricians & Gynecologists, South Lake Tahoe - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, South Lake Tahoe
- Office Supplies, Equipment & Office Furniture Stores, South Lake Tahoe
- Oil & Gas Companies, South Lake Tahoe
- Oil & Gas Exploration & Development, South Lake Tahoe - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, South Lake Tahoe - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, South Lake Tahoe - Oil Companies
- Optical Stores - Eyeglasses, Lenses & Sunglasses, South Lake Tahoe
- Opticians, South Lake Tahoe
- Optometrists, South Lake Tahoe - Eye Doctors, Physicians & Surgeons (Optometry)
- Oriental Goods & Products Stores, South Lake Tahoe
- Ornamental Iron - Residential, South Lake Tahoe - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
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- Ornamental Metal Work, South Lake Tahoe - Steel, Iron, Bronze, etc
- Ornamental Nursery, South Lake Tahoe
- Ornamental Nursery Services, South Lake Tahoe
- Orthodontist, South Lake Tahoe - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, South Lake Tahoe - Orthopedic Shoes
- Orthopedists, South Lake Tahoe - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, South Lake Tahoe
- Other Lodging, South Lake Tahoe
- Outdoor Equipment & Accessories, South Lake Tahoe
- Outdoor Furniture & Patio Furniture, South Lake Tahoe - Garden Furniture Stores
- Outpatient Services, South Lake Tahoe - Outpatient Care
- Ownership Organizations, South Lake Tahoe
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