- Obstetricians & Gynecologists, Stamford - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Stamford
- Occupational Health Care Professionals, Stamford
- Office & Meeting Equipment & Supplies Rental, Stamford
- Office Buildings & Parks, Stamford
- Office Furniture & Equipment Rental & Leasing, Stamford
- Office Furniture & Equipment Repair & Refinish, Stamford
- Office Space on Rent, Stamford - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Stamford
- Offset Printing, Stamford
- Oil & Gas Companies, Stamford
- Oil & Petroleum Products, Stamford - Merchant, Wholesalers, etc
- Oil & Petroleum Retail, Stamford
- Oil Burners, Stamford
- Oil Burners Services, Stamford
- Oil Change & Lubrication, Stamford - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Stamford - Oil Companies
- Oil Petroleum Wholesale, Stamford
- Oil Refinery, Stamford
- Ophthalmologists, Stamford - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Stamford
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Stamford
- Opticians, Stamford
- Optometrists, Stamford - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchestras, Symphonies & Bands, Stamford
- Oriental Massage, Stamford
- Ornamental Iron - Residential, Stamford - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
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- Ornamental Metal Work, Stamford - Steel, Iron, Bronze, etc
- Ornamental Nursery, Stamford
- Ornamental Nursery Services, Stamford
- Orthodontist, Stamford - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Stamford
- Orthopedists, Stamford - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Stamford
- Other Attorneys & Lawyers, Stamford
- Other Building Materials & Supplies, Stamford
- Other Electrical Products, Stamford
- Other Industrial Contractors, Stamford
- Other Lawyers & Attorneys, Stamford
- Other Lodging, Stamford
- Other Office Supply Stores, Stamford
- Other Specialties, Stamford - Doctors, Physicians & Surgeons
- Outboard Motors, Stamford
- Outboard Motors Parts & Repair, Stamford
- Outdoor & Lawn & Garden Equipment Repair & Service, Stamford
- Outdoor Equipment & Accessories, Stamford
- Outdoor Furniture, Stamford
- Outdoor Furniture & Patio Furniture, Stamford - Garden Furniture Stores
- Outerwear Stores, Stamford - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Stamford - Care & Treatment Centers
- Outpatient Services, Stamford - Outpatient Care
- Outplacement Consultants, Stamford
- Outsourcing Services, Stamford
- Ownership Organizations, Stamford
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