- Off Road Vehicles, Yreka
- Off Road Vehicles Parts & Accessories, Yreka
- Office Supplies, Equipment & Office Furniture Stores, Yreka
- Oil & Petroleum Products, Yreka - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Yreka - Auto Oil & Quick Lube
- Old Age Homes Service, Yreka
- Ophthalmologists, Yreka - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Yreka
- Opticians, Yreka
- Optometrists, Yreka - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Yreka
- Ornamental Nursery Products, Yreka
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- Ornamental Nursery Services, Yreka
- Orthopedists, Yreka - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Yreka
- Other Attorneys & Lawyers, Yreka
- Other Building Materials & Supplies, Yreka
- Other Lawyers & Attorneys, Yreka
- Other Lodging, Yreka
- Outdoor & Lawn & Garden Equipment Repair & Service, Yreka
- Outdoor Furniture & Patio Furniture, Yreka - Garden Furniture Stores
- Overhead Door, Yreka
- Oxygen & Respiratory Equipment & Supplies, Yreka - Oxygen Concentrator, Tank, Machine, etc
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