- Obstetricians & Gynecologists, Lutherville Timonium - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Lutherville Timonium
- Occupational Health Care Professionals, Lutherville Timonium
- Office Supplies, Equipment & Office Furniture Stores, Lutherville Timonium
- Oil Change & Lubrication, Lutherville Timonium - Auto Oil & Quick Lube
- Oil Extraction Downhole, Lutherville Timonium
- Oil Industry & Oil Field Equipment & Services, Lutherville Timonium - Oil Companies
- Ophthalmologists, Lutherville Timonium - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Lutherville Timonium
- Opticians, Lutherville Timonium
- Optometrists, Lutherville Timonium - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Lutherville Timonium - Dentists - Oral & Maxillofacial Surgeons
- Organizing Services & Products – Household & Business, Lutherville Timonium
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- Oriental Rugs, Lutherville Timonium
- Ornamental Nursery, Lutherville Timonium
- Ornamental Nursery Services, Lutherville Timonium
- Orthodontist, Lutherville Timonium - Teeth Straightening, Invisalign & Dental Braces
- Osteoporosis Doctors, Lutherville Timonium - Physicians & Surgeons
- Other Attorneys & Lawyers, Lutherville Timonium
- Other Attorneys & Lawyers, Lutherville Timonium
- Other Building Materials & Supplies, Lutherville Timonium
- Other Lawyers & Attorneys, Lutherville Timonium
- Outdoor & Lawn & Garden Equipment Repair & Service, Lutherville Timonium
- Outdoor Equipment & Accessories, Lutherville Timonium
- Outpatient Clinics, Lutherville Timonium - Care & Treatment Centers
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