- Obstetricians & Gynecologists, Douglas - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Douglas - Occupational Medicine
- Occupational Health Care Professionals, Douglas
- Occupational Therapy, Douglas - Occupational Health Specialists
- Off Road Vehicles, Douglas
- Off Road Vehicles Parts & Accessories, Douglas
- Office Supplies, Equipment & Office Furniture Stores, Douglas
- Oil & Petroleum Retail, Douglas
- Oil Change & Lubrication, Douglas - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Douglas - Oil Companies
- Oil Petroleum Wholesale, Douglas
- Oncologists, Douglas - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Douglas - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Douglas
- Opticians, Douglas
- Optometrists, Douglas - Eye Doctors, Physicians & Surgeons (Optometry)
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- Optometry Clinics, Douglas - Eye Clinics
- Ornamental Greenhouses, Douglas
- Ornamental Nursery, Douglas
- Ornamental Nursery Services, Douglas
- Orthodontist, Douglas - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Douglas - Orthopedic Shoes
- Orthopedists, Douglas - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Douglas
- Other Office Supply Stores, Douglas
- Outboard Motors Parts & Repair, Douglas
- Outdoor & Lawn & Garden Equipment Repair & Service, Douglas
- Outdoor Equipment & Accessories, Douglas
- Outdoor Furniture & Patio Furniture, Douglas - Garden Furniture Stores
- Outpatient Services, Douglas - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Douglas - Oxygen Concentrator, Tank, Machine, etc
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