- Obstetricians & Gynecologists, Milford - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Milford
- Occupational Health Care Professionals, Milford
- Office Supplies, Equipment & Office Furniture Stores, Milford
- Offset & Photolithographic Printing, Milford
- Oil & Gas Producers, Milford - Companies
- Oil & Petroleum Products, Milford - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Milford - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Milford - Oil Companies
- Oil Petroleum Wholesale, Milford
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- Optical Stores - Eyeglasses, Lenses & Sunglasses, Milford
- Opticians, Milford
- Optometrists, Milford - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Milford
- Ornamental Nursery Services, Milford
- Ornamental Stone Products, Milford
- Orthodontist, Milford - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Milford
- Outdoor Equipment & Accessories, Milford
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