- Obstetricians & Gynecologists, Porterville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Porterville
- Occupational Therapy, Porterville - Occupational Health Specialists
- Off Road Vehicles, Porterville
- Office Supplies, Equipment & Office Furniture Stores, Porterville
- Oil & Gas Companies, Porterville
- Oil & Petroleum Products, Porterville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Porterville - Auto Oil & Quick Lube
- Oncologists, Porterville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Porterville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Porterville
- Optometrists, Porterville - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchard Equipment, Porterville
- Orchid Growers, Porterville
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- Ornamental Iron - Residential, Porterville - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Porterville - Steel, Iron, Bronze, etc
- Ornamental Nursery, Porterville
- Ornamental Nursery Services, Porterville
- Orthodontist, Porterville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Porterville - Orthopedic Shoes
- Orthopedists, Porterville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Porterville
- Other Lodging, Porterville
- Other Office Supply Stores, Porterville
- Outdoor Equipment & Accessories, Porterville
- Outpatient Services, Porterville - Outpatient Care
- Overhead Door, Porterville
- Oxygen & Respiratory Equipment & Supplies, Porterville - Oxygen Concentrator, Tank, Machine, etc
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