- Tanning Salons, Port Washington
- Tax Return Preparation, Port Washington
- Taxi Cab Service, Port Washington
- Taxi Service, Port Washington
- Technological Research & Development, Port Washington
- Telecommunications, Port Washington
- Telecommunications Companies, Businesses & Services, Port Washington
- Telephone Answering Service, Port Washington - Messenger Services
- Telephone Equipment & Phone Systems, Port Washington - Sales, Service & Repair
- Telephone Equipment & Systems - Repair & Service, Port Washington - Telecommunication Services
- Television Stores & Dealers, Port Washington
- Tennis Courts, Port Washington
- Tennis Lessons, Port Washington - Includes Badminton Coaching
- Terrazzo Tile Marble & Mosaic Contractors, Port Washington
- Textile & Apparel Services, Port Washington
- Textile Brokers, Port Washington
- Textile Machinery, Supplies & Equipment, Port Washington - Cutting Machine, Embroidery Machine, Sewing Supplies, etc
- Textile Restoration, Port Washington
- Thai Restaurants, Port Washington
- Theatrical Producers & Services, Port Washington
- Thread Rolling Cutting & Grinding, Port Washington
- Thread Rolling, Grinding & Cutting, Port Washington - Pipe Cutting & Threading
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- Thrift Stores, Resale & Consignment Shops, Port Washington
- Tires - Wholesale & Retail, Port Washington
- Title & Surety Insurance, Port Washington
- Tools & Hardware Supplies, Port Washington
- Tours & Guide Services, Port Washington
- Towing Service, Port Washington
- Transportation, Port Washington
- Transportation Equipment And Supplies - Except Motor Vehicle, Port Washington
- Transportation Equipment Manufacturers, Port Washington
- Transportation Facilities & Services, Port Washington
- Transportation Rental & Leasing, Port Washington
- Travel & Tourism, Port Washington
- Travel Arrangement & Services, Port Washington
- Trial & Litigation Attorneys & Lawyers, Port Washington
- Trial & Litigation Lawyers & Attorneys, Port Washington
- Truck Rental & Leasing, Port Washington - Rent a Truck & Tractor
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Port Washington - Collection, Removal, Disposal, Recycling, etc
- Trucking Petroleum Products, Port Washington
- Trust And Will Attorneys & Lawyers, Port Washington
- Tugboat & Towing Service, Port Washington
- Tutoring Instructor, Port Washington
- Typing & Word Processing Services, Port Washington
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