- Obstetricians & Gynecologists, Oroville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Oroville
- Office Supplies, Equipment & Office Furniture Stores, Oroville
- Oil & Gas Exploration & Development, Oroville - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Oroville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Oroville - Oil Companies
- Ophthalmologists, Oroville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Oroville - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Oroville
- Opticians, Oroville
- Optometrists, Oroville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Oroville - Dentists - Oral & Maxillofacial Surgeons
- Oriental Goods & Products Stores, Oroville
- Ornamental Iron - Residential, Oroville - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Oroville - Steel, Iron, Bronze, etc
- Ornamental Nursery, Oroville
- Ornamental Nursery Products, Oroville
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- Ornamental Nursery Services, Oroville
- Orthodontist, Oroville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Oroville - Orthopedic Shoes
- Orthopedists, Oroville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Oroville
- Other Attorneys & Lawyers, Oroville
- Other Building Materials & Supplies, Oroville
- Other Lawyers & Attorneys, Oroville
- Other Office Supply Stores, Oroville
- Outboard Motors, Oroville
- Outboard Motors Parts & Repair, Oroville
- Outdoor & Lawn & Garden Equipment Repair & Service, Oroville
- Outdoor Centers, Oroville
- Outdoor Equipment & Accessories, Oroville
- Outdoor Power Equipment Repair, Oroville
- Oxygen & Respiratory Equipment & Supplies, Oroville - Oxygen Concentrator, Tank, Machine, etc
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