- Obstetricians & Gynecologists, Milford - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Milford
- Occupational Therapy, Milford - Occupational Health Specialists
- Off Road Vehicles, Milford
- Off Road Vehicles Parts & Accessories, Milford
- Office Buildings & Parks, Milford
- Office Equipment & Supplies Manufacturers, Milford
- Office Supplies, Equipment & Office Furniture Stores, Milford
- Oil & Petroleum Products, Milford - Merchant, Wholesalers, etc
- Oil Burners Services, Milford
- Oil Change & Lubrication, Milford - Auto Oil & Quick Lube
- Oncologists, Milford - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Milford - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Milford
- Opticians, Milford
- Optometrists, Milford - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Milford - Dentists - Oral & Maxillofacial Surgeons
- Oriental Massage, Milford
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- Ornamental Metal Work, Milford - Steel, Iron, Bronze, etc
- Ornamental Nursery, Milford
- Ornamental Nursery Services, Milford
- Orthopedic Shoes, Milford
- Orthopedists, Milford - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Milford
- Other Attorneys & Lawyers, Milford
- Other Building Materials & Supplies, Milford
- Other Industrial Goods, Milford
- Other Lawyers & Attorneys, Milford
- Outdoor & Lawn & Garden Equipment Repair & Service, Milford
- Outdoor Equipment & Accessories, Milford
- Outdoor Furniture & Patio Furniture, Milford - Garden Furniture Stores
- Outerwear Stores, Milford - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Milford - Care & Treatment Centers
- Outpatient Services, Milford - Outpatient Care
- Ownership Organizations, Milford
- Oxygen & Respiratory Equipment & Supplies, Milford - Oxygen Concentrator, Tank, Machine, etc
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