- Office Buildings & Parks, Susanville
- Office Supplies, Equipment & Office Furniture Stores, Susanville
- Oil & Petroleum Products, Susanville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Susanville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Susanville - Oil Companies
- Opticians, Susanville
- Optometrists, Susanville - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Susanville
- Ornamental Nursery Services, Susanville
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- Orthodontist, Susanville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Susanville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Susanville
- Other Attorneys & Lawyers, Susanville
- Other Building Materials & Supplies, Susanville
- Other Lawyers & Attorneys, Susanville
- Outdoor Equipment & Accessories, Susanville
- Oxygen & Respiratory Equipment & Supplies, Susanville - Oxygen Concentrator, Tank, Machine, etc
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