- Occupational Health & Safety, Watsonville
- Occupational Health Care Physicians & Surgeons, Watsonville - Occupational Medicine
- Occupational Health Care Professionals, Watsonville
- Office Supplies, Equipment & Office Furniture Stores, Watsonville
- Oil & Gas Companies, Watsonville
- Oil & Petroleum Products, Watsonville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Watsonville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Watsonville - Oil Companies
- Oil Petroleum Wholesale, Watsonville
- Oils Industrial, Watsonville
- Ophthalmologists, Watsonville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Watsonville
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Watsonville
- Opticians, Watsonville
- Optometrists, Watsonville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Watsonville - Dentists - Oral & Maxillofacial Surgeons
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- Orchard Service, Watsonville
- Oriental Goods & Products Stores, Watsonville
- Ornamental Greenhouses, Watsonville
- Ornamental Iron - Residential, Watsonville - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Watsonville - Steel, Iron, Bronze, etc
- Ornamental Nursery, Watsonville
- Ornamental Nursery Products, Watsonville
- Ornamental Nursery Services, Watsonville
- Orthodontist, Watsonville - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Watsonville
- Outdoor & Lawn & Garden Equipment Repair & Service, Watsonville
- Outdoor Equipment & Accessories, Watsonville
- Outerwear & Accessories Manufacturers, Watsonville
- Outpatient Clinics, Watsonville - Care & Treatment Centers
- Ownership Organizations, Watsonville
- Oxygen & Respiratory Equipment & Supplies, Watsonville - Oxygen Concentrator, Tank, Machine, etc
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