- Obstetricians & Gynecologists, Oakland - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Oakland
- Oil Change & Lubrication, Oakland - Auto Oil & Quick Lube
- Ophthalmologists, Oakland - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Opticians, Oakland
- Optometrists, Oakland - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Oakland - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Oakland
- Ornamental Nursery, Oakland
- Ornamental Nursery Services, Oakland
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- Orthodontist, Oakland - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Oakland - Orthopedic Shoes
- Other Building Materials & Supplies, Oakland
- Outboard Motors, Oakland
- Outdoor & Lawn & Garden Equipment Repair & Service, Oakland
- Outdoor Equipment & Accessories, Oakland
- Outdoor Furniture & Patio Furniture, Oakland - Garden Furniture Stores
- Outpatient Services, Oakland - Outpatient Care
- Ownership Organizations, Oakland
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