- Obstetricians & Gynecologists, Chambersburg - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Chambersburg - Occupational Medicine
- Occupational Health Care Professionals, Chambersburg
- Occupational Therapy, Chambersburg - Occupational Health Specialists
- Office Buildings & Parks, Chambersburg
- Office Supplies, Equipment & Office Furniture Stores, Chambersburg
- Oil Change & Lubrication, Chambersburg - Auto Oil & Quick Lube
- Oil Field Services Mud Disposal & Jacking, Chambersburg
- Oil Industry & Oil Field Equipment & Services, Chambersburg - Oil Companies
- Ophthalmologists, Chambersburg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Chambersburg
- Opticians, Chambersburg
- Optometrists, Chambersburg - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Chambersburg - Eye Clinics
- Oral Surgeon, Chambersburg - Dentists - Oral & Maxillofacial Surgeons
- Oriental Restaurants, Chambersburg
- Oriental Rugs, Chambersburg
- Ornamental Greenhouses, Chambersburg
- Ornamental Iron Work, Chambersburg
- Ornamental Nursery, Chambersburg
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- Ornamental Nursery Products, Chambersburg
- Ornamental Nursery Services, Chambersburg
- Orthodontist, Chambersburg - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Chambersburg
- Orthopedic & Prosthetic Appliances & Shoes, Chambersburg - Orthopedic Shoes
- Orthopedists, Chambersburg - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Chambersburg
- Other Attorneys & Lawyers, Chambersburg
- Other Building Materials & Supplies, Chambersburg
- Other Lawyers & Attorneys, Chambersburg
- Other Lodging, Chambersburg
- Outdoor & Lawn & Garden Equipment Repair & Service, Chambersburg
- Outdoor Advertising & Billboard, Chambersburg
- Outdoor Equipment & Accessories, Chambersburg
- Outdoor Furniture, Chambersburg
- Outdoor Furniture & Patio Furniture, Chambersburg - Garden Furniture Stores
- Outpatient Services, Chambersburg - Outpatient Care
- Overhead Door, Chambersburg
- Oxygen & Respiratory Equipment & Supplies, Chambersburg - Oxygen Concentrator, Tank, Machine, etc
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