- Occupational Health Care Professionals, Los Altos
- Occupational Therapy, Los Altos - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Los Altos
- Oil And Petroleum Products, Los Altos
- Oil Industry & Oil Field Equipment & Services, Los Altos - Oil Companies
- Old Age Homes Service, Los Altos
- Optical Goods Manufacturers, Los Altos
- Optical Goods Repair & Service, Los Altos - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Los Altos
- Opticians, Los Altos
- Optometrists, Los Altos - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Los Altos - Eye Clinics
- Orchestras, Symphonies & Bands, Los Altos
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- Oriental Goods & Products Stores, Los Altos
- Ornamental Iron - Residential, Los Altos - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Los Altos - Steel, Iron, Bronze, etc
- Ornamental Nursery, Los Altos
- Ornamental Nursery Services, Los Altos
- Orthopedic & Prosthetic Appliances & Shoes, Los Altos - Orthopedic Shoes
- Orthopedists, Los Altos - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Los Altos
- Outdoor & Lawn & Garden Equipment Repair & Service, Los Altos
- Outdoor Equipment & Accessories, Los Altos
- Outerwear & Accessories Manufacturers, Los Altos
- Overhead Door, Los Altos
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