- Obstetricians & Gynecologists, Davis - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Davis
- Occupational Health Care Professionals, Davis
- Occupational Therapy, Davis - Occupational Health Specialists
- Office Buildings & Parks, Davis
- Office Supplies, Equipment & Office Furniture Stores, Davis
- Oil Change & Lubrication, Davis - Auto Oil & Quick Lube
- Ophthalmologists, Davis - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Davis
- Opticians, Davis
- Optometrists, Davis - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Davis - Dentists - Oral & Maxillofacial Surgeons
- Organizing Services & Products – Household & Business, Davis
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- Ornamental Nursery, Davis
- Ornamental Nursery Products, Davis
- Ornamental Nursery Services, Davis
- Orthodontist, Davis - Teeth Straightening, Invisalign & Dental Braces
- Other Attorneys & Lawyers, Davis
- Other Attorneys & Lawyers, Davis
- Other Building Materials & Supplies, Davis
- Other Lawyers & Attorneys, Davis
- Other Lodging, Davis
- Outdoor & Lawn & Garden Equipment Repair & Service, Davis
- Outdoor Equipment & Accessories, Davis
- Outpatient Services, Davis - Outpatient Care
- Ownership Organizations, Davis
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