- Obstetricians & Gynecologists, State College - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, State College
- Occupational Health Care Physicians & Surgeons, State College - Occupational Medicine
- Occupational Health Care Professionals, State College
- Off Road Vehicles, State College
- Off Road Vehicles Parts & Accessories, State College
- Office & Meeting Equipment & Supplies Rental, State College
- Office Buildings & Parks, State College
- Office Furniture & Equipment Rental & Leasing, State College
- Office Supplies, Equipment & Office Furniture Stores, State College
- Oil & Gas Exploration & Development, State College - Oil Field Exploration, Monitoring & Remediation
- Oil & Petroleum Products, State College - Merchant, Wholesalers, etc
- Oil Change & Lubrication, State College - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, State College - Oil Companies
- Ophthalmologists, State College - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, State College
- Opticians, State College
- Optometrists, State College - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, State College - Eye Clinics
- Oral Surgeon, State College - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, State College
- Organizing Services & Products – Household & Business, State College
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- Oriental Goods & Products Stores, State College
- Oriental Rugs, State College
- Ornamental Nursery, State College
- Ornamental Nursery Services, State College
- Orthodontist, State College - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, State College
- Orthopedic & Prosthetic Appliances & Shoes, State College - Orthopedic Shoes
- Orthopedists, State College - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, State College
- Other Attorneys & Lawyers, State College
- Other Attorneys & Lawyers, State College
- Other Building Materials & Supplies, State College
- Other Lawyers & Attorneys, State College
- Outdoor & Lawn & Garden Equipment Repair & Service, State College
- Outdoor Equipment & Accessories, State College
- Outdoor Furniture, State College
- Outdoor Furniture & Patio Furniture, State College - Garden Furniture Stores
- Outerwear Stores, State College - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, State College - Outpatient Care
- Ownership Organizations, State College
- Oxygen & Respiratory Equipment & Supplies, State College - Oxygen Concentrator, Tank, Machine, etc
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