- Obstetricians & Gynecologists, Fortuna - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Fortuna
- Oil & Gas Producers, Fortuna - Companies
- Oil & Petroleum Products, Fortuna - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Fortuna
- Oil Change & Lubrication, Fortuna - Auto Oil & Quick Lube
- Old Age Homes Service, Fortuna
- Omelette & Quiche Restaurants, Fortuna
- Ophthalmologists, Fortuna - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Fortuna
- Opticians, Fortuna
- Optometrists, Fortuna - Eye Doctors, Physicians & Surgeons (Optometry)
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- Optometry Clinics, Fortuna - Eye Clinics
- Ornamental Iron - Residential, Fortuna - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Fortuna - Steel, Iron, Bronze, etc
- Ornamental Nursery, Fortuna
- Ornamental Nursery Services, Fortuna
- Orthopedic Shoes, Fortuna
- Orthopedists, Fortuna - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Fortuna
- Outboard Motors, Fortuna
- Outdoor & Lawn & Garden Equipment Repair & Service, Fortuna
- Outdoor Equipment & Accessories, Fortuna
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