- Off Road Vehicles, Hayward
- Off Road Vehicles Parts & Accessories, Hayward
- Office Supplies, Equipment & Office Furniture Stores, Hayward
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Hayward
- Opticians, Hayward
- Optometrists, Hayward - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Hayward
- Ornamental Nursery, Hayward
- Ornamental Nursery Products, Hayward
- Ornamental Nursery Services, Hayward
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- Orthodontist, Hayward - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Hayward
- Other Lodging, Hayward
- Outboard Motors, Hayward
- Outdoor & Lawn & Garden Equipment Repair & Service, Hayward
- Outdoor Advertising & Billboard, Hayward
- Outdoor Equipment & Accessories, Hayward
- Overhead Door, Hayward
- Oxygen & Respiratory Equipment & Supplies, Hayward - Oxygen Concentrator, Tank, Machine, etc
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