- Off Road Vehicles, Colville
- Off Road Vehicles Parts & Accessories, Colville
- Office Supplies, Equipment & Office Furniture Stores, Colville
- Oil Change & Lubrication, Colville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Colville - Oil Companies
- Oil Refinery, Colville
- Ophthalmologists, Colville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Colville
- Optometrists, Colville - Eye Doctors, Physicians & Surgeons (Optometry)
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- Optometry Clinics, Colville - Eye Clinics
- Ornamental Greenhouses, Colville
- Ornamental Nursery, Colville
- Ornamental Nursery Products, Colville
- Ornamental Nursery Services, Colville
- Other Building Materials & Supplies, Colville
- Other Lodging, Colville
- Outdoor & Lawn & Garden Equipment Repair & Service, Colville
- Oxygen & Respiratory Equipment & Supplies, Colville - Oxygen Concentrator, Tank, Machine, etc
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