- Office Supplies, Equipment & Office Furniture Stores, Mineola
- Oil & Gas Exploration & Development, Mineola - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Land Leases Properties & Royalties, Mineola
- Oil & Petroleum Products, Mineola - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Mineola - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Mineola - Oil Companies
- Ophthalmologists, Mineola - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Mineola
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- Opticians, Mineola
- Optometrists, Mineola - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Metal Work, Mineola - Steel, Iron, Bronze, etc
- Ornamental Nursery, Mineola
- Ornamental Nursery Services, Mineola
- Other Building Materials & Supplies, Mineola
- Other Lodging, Mineola
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