- Warehousing & Storage, Southold - Warehouse Services
- Watch, Clock & Jewelry Repair, Southold
- Water Transportation, Except Passenger, Southold
- Website Design, Management & Maintenance Services, Southold
- Wedding & Bridal Services, Southold
- Wedding Equipment Rental, Southold
- Wheel Alignment, Frame & Axle Service & Repair, Southold
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- Window & Blind Cleaning, Southold
- Window & Door - Installation & Repair, Southold - Install, Repair & Replace
- Window Blinds, Shades & Window Treatments and Coverings, Southold - Roller & Roman Shades - Wood, Metal & Vertical Blinds
- Windows and Doors, Southold - Wholesale, Manufacturers & Suppliers
- Wine Manufacturers, Southold
- Woodworking Contractors, Southold - Carpentry Contractors
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