- Obstetricians & Gynecologists, Ridgefield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Ridgefield
- Oil & Petroleum Products, Ridgefield - Merchant, Wholesalers, etc
- Oil Burners Services, Ridgefield
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Ridgefield
- Opticians, Ridgefield
- Optometrists, Ridgefield - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Ridgefield - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Ridgefield
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- Ornamental Nursery Services, Ridgefield
- Orthodontist, Ridgefield - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Ridgefield - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Ridgefield
- Other Lodging, Ridgefield
- Outdoor & Lawn & Garden Equipment Repair & Service, Ridgefield
- Outdoor Furniture & Patio Furniture, Ridgefield - Garden Furniture Stores
- Outpatient Clinics, Ridgefield - Care & Treatment Centers
- Ownership Organizations, Ridgefield
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