- Office Buildings & Parks, Cockeysville
- Office Equipment & Supplies Manufacturers, Cockeysville
- Office Space on Rent, Cockeysville - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Cockeysville
- Oil Change & Lubrication, Cockeysville - Auto Oil & Quick Lube
- Oil Extraction Downhole, Cockeysville
- Oil Industry & Oil Field Equipment & Services, Cockeysville - Oil Companies
- Old Age Homes Service, Cockeysville
- Ophthalmologists, Cockeysville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Cockeysville
- Opticians, Cockeysville
- Optometrists, Cockeysville - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchestras, Symphonies & Bands, Cockeysville
- Oriental Rugs, Cockeysville
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- Ornamental Nursery, Cockeysville
- Ornamental Nursery Services, Cockeysville
- Orthodox Churches, Cockeysville
- Other Attorneys & Lawyers, Cockeysville
- Other Attorneys & Lawyers, Cockeysville
- Other Building Materials & Supplies, Cockeysville
- Other Lawyers & Attorneys, Cockeysville
- Other Lodging, Cockeysville
- Outdoor & Lawn & Garden Equipment Repair & Service, Cockeysville
- Outdoor Equipment & Accessories, Cockeysville
- Outdoor Furniture, Cockeysville
- Outdoor Furniture & Patio Furniture, Cockeysville - Garden Furniture Stores
- Outplacement Consultants, Cockeysville
- Oxygen & Respiratory Equipment & Supplies, Cockeysville - Oxygen Concentrator, Tank, Machine, etc
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