- Obstetricians & Gynecologists, Leitchfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Leitchfield
- Oil & Gas Companies, Leitchfield
- Oil & Petroleum Products, Leitchfield - Merchant, Wholesalers, etc
- Oil & Petroleum Retail, Leitchfield
- Oil Industry & Oil Field Equipment & Services, Leitchfield - Oil Companies
- Oil Petroleum Wholesale, Leitchfield
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Leitchfield
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- Opticians, Leitchfield
- Optometrists, Leitchfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Metal Work, Leitchfield - Steel, Iron, Bronze, etc
- Ornamental Nursery, Leitchfield
- Ornamental Nursery Services, Leitchfield
- Orthopedists, Leitchfield - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Leitchfield
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