- Obstetricians & Gynecologists, York - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, York - Occupational Medicine
- Occupational Health Care Professionals, York
- Occupational Medicine Doctors, York - Physicians & Surgeons
- Occupational Therapy, York - Occupational Health Specialists
- Office Buildings & Parks, York
- Office Partitions & Dividers, York
- Office Supplies, Equipment & Office Furniture Stores, York
- Oil & Gas Companies, York
- Oil Change & Lubrication, York - Auto Oil & Quick Lube
- Oil Field Services Mud Disposal & Jacking, York
- Oil Industry & Oil Field Equipment & Services, York - Oil Companies
- Oil Refinery, York
- Oils Recycling, York
- Oncologists, York - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, York - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, York
- Optical Goods Repair & Service, York - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, York
- Opticians, York
- Optometrists, York - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, York - Eye Clinics
- Oral Surgeon, York - Dentists - Oral & Maxillofacial Surgeons
- Organ Donation & Tissue Banks, York
- Organs Tuning & Repair, York
- Oriental Rugs, York
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- Ornamental Greenhouses, York
- Ornamental Iron - Residential, York - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, York - Steel, Iron, Bronze, etc
- Ornamental Nursery, York
- Ornamental Nursery Products, York
- Ornamental Nursery Services, York
- Orthodontist, York - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, York
- Orthopedic & Prosthetic Appliances & Shoes, York - Orthopedic Shoes
- Orthopedists, York - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, York
- Osteoporosis Doctors, York - Physicians & Surgeons
- Other Attorneys & Lawyers, York
- Other Attorneys & Lawyers, York
- Other Building Materials & Supplies, York
- Other Electrical Products, York
- Other Industrial Contractors, York
- Other Lawyers & Attorneys, York
- Other Lodging, York
- Otolaryngologists, York - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outdoor & Lawn & Garden Equipment Repair & Service, York
- Outdoor Advertising & Billboard, York
- Outdoor Equipment & Accessories, York
- Outdoor Furniture & Patio Furniture, York - Garden Furniture Stores
- Outpatient Services, York - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, York - Oxygen Concentrator, Tank, Machine, etc
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