- Obstetricians & Gynecologists, Kailua - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Kailua
- Occupational Health Care Physicians & Surgeons, Kailua - Occupational Medicine
- Occupational Health Care Professionals, Kailua
- Occupational Medicine Doctors, Kailua - Physicians & Surgeons
- Office Supplies, Equipment & Office Furniture Stores, Kailua
- Oil Change & Lubrication, Kailua - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Kailua - Oil Companies
- Oil Refinery, Kailua
- Ophthalmologists, Kailua - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Kailua
- Opticians, Kailua
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- Optometrists, Kailua - Eye Doctors, Physicians & Surgeons (Optometry)
- Ordnance & Military Accessories Manufacturers, Kailua
- Ornamental Nursery, Kailua
- Ornamental Nursery Services, Kailua
- Orthodontist, Kailua - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Kailua - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Kailua
- Outdoor & Lawn & Garden Equipment Repair & Service, Kailua
- Outdoor Equipment & Accessories, Kailua
- Outpatient Services, Kailua - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Kailua - Oxygen Concentrator, Tank, Machine, etc
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