- Obstetricians & Gynecologists, Visalia - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Visalia
- Occupational Health Care Physicians & Surgeons, Visalia - Occupational Medicine
- Occupational Health Care Professionals, Visalia
- Occupational Medicine Doctors, Visalia - Physicians & Surgeons
- Occupational Therapy, Visalia - Occupational Health Specialists
- Off Road Vehicles, Visalia
- Office Buildings & Parks, Visalia
- Office Equipment & Supplies Manufacturers, Visalia
- Office Supplies, Equipment & Office Furniture Stores, Visalia
- Oil & Gas Companies, Visalia
- Oil & Petroleum Products, Visalia - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Visalia
- Oil Change & Lubrication, Visalia - Auto Oil & Quick Lube
- Oil Field Services Testing Measuring & Surveying, Visalia
- Oil Industry & Oil Field Equipment & Services, Visalia - Oil Companies
- Oils Asphalt & Road, Visalia
- Oils Recycling, Visalia
- Oncologists, Visalia - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Visalia - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Visalia
- Optical Goods Repair & Service, Visalia - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Visalia
- Opticians, Visalia
- Optometrists, Visalia - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Visalia - Eye Clinics
- Oral Surgeon, Visalia - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Visalia
- Orchestras, Symphonies & Bands, Visalia
- Organizing Services & Products – Household & Business, Visalia
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- Oriental Goods & Products Stores, Visalia
- Oriental Massage, Visalia
- Ornamental Iron - Residential, Visalia - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Visalia - Steel, Iron, Bronze, etc
- Ornamental Nursery, Visalia
- Ornamental Nursery Products, Visalia
- Ornamental Nursery Services, Visalia
- Orthodontist, Visalia - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Visalia - Orthopedic Shoes
- Orthopedic Shoes, Visalia
- Orthopedists, Visalia - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Visalia
- Other Attorneys & Lawyers, Visalia
- Other Building Materials & Supplies, Visalia
- Other Industrial Contractors, Visalia
- Other Lawyers & Attorneys, Visalia
- Other Lodging, Visalia
- Other Office Supply Stores, Visalia
- Other Specialties, Visalia - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Visalia
- Outdoor Centers, Visalia
- Outdoor Equipment & Accessories, Visalia
- Outdoor Furniture & Patio Furniture, Visalia - Garden Furniture Stores
- Outdoor Power Equipment Repair, Visalia
- Outerwear Stores, Visalia - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Visalia - Outpatient Care
- Outplacement Counseling, Visalia
- Overhead Door, Visalia
- Oxygen & Respiratory Equipment & Supplies, Visalia - Oxygen Concentrator, Tank, Machine, etc
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