- Obstetricians & Gynecologists, Prince Frederick - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Prince Frederick
- Occupational Therapy, Prince Frederick - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Prince Frederick
- Oil & Petroleum Products, Prince Frederick - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Prince Frederick - Auto Oil & Quick Lube
- Oncologists, Prince Frederick - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Prince Frederick - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Prince Frederick
- Opticians, Prince Frederick
- Optometrists, Prince Frederick - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Prince Frederick
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- Ornamental Nursery Services, Prince Frederick
- Orthodontist, Prince Frederick - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Prince Frederick - Orthopedic Shoes
- Orthopedists, Prince Frederick - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Prince Frederick
- Other Building Materials & Supplies, Prince Frederick
- Other Specialties, Prince Frederick - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Prince Frederick
- Outdoor Equipment & Accessories, Prince Frederick
- Outdoor Furniture & Patio Furniture, Prince Frederick - Garden Furniture Stores
- Overhead Door, Prince Frederick
- Oxygen & Respiratory Equipment & Supplies, Prince Frederick - Oxygen Concentrator, Tank, Machine, etc
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