- Occupational Health Care Physicians & Surgeons, Linthicum Heights - Occupational Medicine
- Occupational Health Care Professionals, Linthicum Heights
- Office Supplies, Equipment & Office Furniture Stores, Linthicum Heights
- Oil Extraction Downhole, Linthicum Heights
- Oil Industry & Oil Field Equipment & Services, Linthicum Heights - Oil Companies
- Ophthalmologists, Linthicum Heights - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Linthicum Heights
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Linthicum Heights
- Opticians, Linthicum Heights
- Optometrists, Linthicum Heights - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Linthicum Heights
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- Ornamental Nursery, Linthicum Heights
- Ornamental Nursery Services, Linthicum Heights
- Orthodox Churches, Linthicum Heights
- Orthopedic & Prosthetic Appliances & Shoes, Linthicum Heights - Orthopedic Shoes
- Orthotics and Prosthetics, Linthicum Heights
- Other Building Materials & Supplies, Linthicum Heights
- Other Lodging, Linthicum Heights
- Outdoor Equipment & Accessories, Linthicum Heights
- Overhead Door, Linthicum Heights
- Oxygen & Respiratory Equipment & Supplies, Linthicum Heights - Oxygen Concentrator, Tank, Machine, etc
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