- Obstetricians & Gynecologists, Westport - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Westport
- Occupational Therapy, Westport - Occupational Health Specialists
- Office Space on Rent, Westport - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Westport
- Oil & Petroleum Products, Westport - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Westport - Auto Oil & Quick Lube
- Online Publications, Westport
- Ophthalmologists, Westport - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Westport
- Opticians, Westport
- Optometrists, Westport - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Westport
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- Oriental Rugs, Westport
- Ornamental Nursery, Westport
- Ornamental Nursery Services, Westport
- Orthodox Synagogues, Westport
- Other Attorneys & Lawyers, Westport
- Other Attorneys & Lawyers, Westport
- Other Building Materials & Supplies, Westport
- Other Lawyers & Attorneys, Westport
- Other Office Supply Stores, Westport
- Outdoor Furniture & Patio Furniture, Westport - Garden Furniture Stores
- Outpatient Services, Westport - Outpatient Care
- Ownership Organizations, Westport
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