- Obstetricians & Gynecologists, Towson - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Towson
- Office Space on Rent, Towson - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Towson
- Oil Change & Lubrication, Towson - Auto Oil & Quick Lube
- Oil Extraction Downhole, Towson
- Oil Industry & Oil Field Equipment & Services, Towson - Oil Companies
- Oil Petroleum Wholesale, Towson
- Oncologists, Towson - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Towson - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Towson
- Optical Goods Repair & Service, Towson - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Towson
- Opticians, Towson
- Optometrists, Towson - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Towson
- Oriental Restaurants, Towson
- Oriental Rugs, Towson
- Ornamental Nursery, Towson
- Ornamental Nursery Services, Towson
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- Orthodontist, Towson - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Towson
- Orthopedic & Prosthetic Appliances & Shoes, Towson - Orthopedic Shoes
- Orthopedic Shoes, Towson
- Orthopedists, Towson - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Towson
- Osteoporosis Doctors, Towson - Physicians & Surgeons
- Other Attorneys & Lawyers, Towson
- Other Attorneys & Lawyers, Towson
- Other Building Materials & Supplies, Towson
- Other Industrial Contractors, Towson
- Other Lawyers & Attorneys, Towson
- Other Lodging, Towson
- Outdoor Equipment & Accessories, Towson
- Outdoor Furniture & Patio Furniture, Towson - Garden Furniture Stores
- Outerwear Stores, Towson - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Towson - Outpatient Care
- Outplacement Consultants, Towson
- Oxygen & Respiratory Equipment & Supplies, Towson - Oxygen Concentrator, Tank, Machine, etc
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