- Obstetricians & Gynecologists, Milford - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Milford
- Occupational Health Care Professionals, Milford
- Occupational Therapy, Milford - Occupational Health Specialists
- Off Road Vehicles, Milford
- Off Road Vehicles Parts & Accessories, Milford
- Office Supplies, Equipment & Office Furniture Stores, Milford
- Oil Change & Lubrication, Milford - Auto Oil & Quick Lube
- Ophthalmologists, Milford - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Milford
- Opticians, Milford
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- Optometrists, Milford - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Milford
- Ornamental Nursery Services, Milford
- Orthodontist, Milford - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Milford - Orthopedic Shoes
- Orthotics and Prosthetics, Milford
- Other Building Materials & Supplies, Milford
- Other Electrical Products, Milford
- Other Office Supply Stores, Milford
- Outdoor & Lawn & Garden Equipment Repair & Service, Milford
- Overhead Door, Milford
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