- Obstetricians & Gynecologists, Kamuela - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Kamuela
- Off Road Vehicles Parts & Accessories, Kamuela
- Office Furniture Manufacturers, Kamuela
- Office Systems Designer & Consultants, Kamuela
- Oil & Gas Companies, Kamuela
- Oil Industry & Oil Field Equipment & Services, Kamuela - Oil Companies
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Kamuela
- Optometrists, Kamuela - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Kamuela - Dentists - Oral & Maxillofacial Surgeons
- Orchid Growers, Kamuela
- Ornamental Nursery, Kamuela
- Ornamental Nursery Services, Kamuela
- Orthopedists, Kamuela - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Kamuela
- Other Lodging, Kamuela
- Outdoor Equipment & Accessories, Kamuela
- Ownership Organizations, Kamuela
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