- Obstetricians & Gynecologists, Lewiston - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Lewiston
- Off Road Vehicles Parts & Accessories, Lewiston
- Office Furniture & Equipment Repair & Refinish, Lewiston
- Office Supplies, Equipment & Office Furniture Stores, Lewiston
- Oil Change & Lubrication, Lewiston - Auto Oil & Quick Lube
- Old Age Homes Service, Lewiston
- Ophthalmologists, Lewiston - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Lewiston - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Lewiston
- Opticians, Lewiston
- Optometrists, Lewiston - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Lewiston - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Iron - Residential, Lewiston - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Lewiston - Steel, Iron, Bronze, etc
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- Ornamental Nursery, Lewiston
- Ornamental Nursery Products, Lewiston
- Ornamental Nursery Services, Lewiston
- Orthodontist, Lewiston - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Lewiston - Orthopedic Shoes
- Orthopedists, Lewiston - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Lewiston
- Other Building Materials & Supplies, Lewiston
- Other Lodging, Lewiston
- Outboard Motors, Lewiston
- Outboard Motors Parts & Repair, Lewiston
- Outdoor & Lawn & Garden Equipment Repair & Service, Lewiston
- Outdoor Advertising & Billboard, Lewiston
- Outdoor Equipment & Accessories, Lewiston
- Outdoor Furniture & Patio Furniture, Lewiston - Garden Furniture Stores
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