- Obstetricians & Gynecologists, Placentia - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Placentia
- Occupational Health Care Professionals, Placentia
- Office Buildings & Parks, Placentia
- Office Supplies, Equipment & Office Furniture Stores, Placentia
- Oil & Gas Companies, Placentia
- Oil & Gas Producers, Placentia - Companies
- Oil & Petroleum Products, Placentia - Merchant, Wholesalers, etc
- Ophthalmologists, Placentia - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Placentia
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Placentia
- Opticians, Placentia
- Optometrists, Placentia - Eye Doctors, Physicians & Surgeons (Optometry)
- Oriental Goods & Products Stores, Placentia
- Ornamental Iron - Residential, Placentia - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
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- Ornamental Metal Work, Placentia - Steel, Iron, Bronze, etc
- Ornamental Nursery, Placentia
- Ornamental Nursery Products, Placentia
- Ornamental Nursery Services, Placentia
- Orthodontist, Placentia - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Placentia - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Placentia - Physicians & Surgeons
- Other Attorneys & Lawyers, Placentia
- Other Attorneys & Lawyers, Placentia
- Other Building Materials & Supplies, Placentia
- Other Lawyers & Attorneys, Placentia
- Outdoor Equipment & Accessories, Placentia
- Overhead Door, Placentia
- Ownership Organizations, Placentia
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