- Obstetricians & Gynecologists, Elkton - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Elkton
- Occupational Health Care Professionals, Elkton
- Office Supplies, Equipment & Office Furniture Stores, Elkton
- Oil & Petroleum Products, Elkton - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Elkton - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Elkton - Oil Companies
- Oil Petroleum Wholesale, Elkton
- Oncologists, Elkton - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Elkton - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Elkton
- Opticians, Elkton
- Optometrists, Elkton - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Elkton
- Ornamental Nursery, Elkton
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- Ornamental Nursery Services, Elkton
- Orthodontist, Elkton - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Elkton - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Elkton - Physicians & Surgeons
- Other Attorneys & Lawyers, Elkton
- Other Attorneys & Lawyers, Elkton
- Other Building Materials & Supplies, Elkton
- Other Lawyers & Attorneys, Elkton
- Other Lodging, Elkton
- Outdoor & Lawn & Garden Equipment Repair & Service, Elkton
- Outdoor Advertising & Billboard, Elkton
- Outdoor Equipment & Accessories, Elkton
- Outdoor Furniture & Patio Furniture, Elkton - Garden Furniture Stores
- Overhead Door, Elkton
- Oxygen & Respiratory Equipment & Supplies, Elkton - Oxygen Concentrator, Tank, Machine, etc
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