- Tank & Pipe Contractors, Sayville
- Tanks Disposal, Sayville
- Tanning Salons, Sayville
- Tattooing, Sayville
- Tax Return Preparation, Sayville
- Taxi Cab Service, Sayville
- Taxi Service, Sayville
- Telecommunications, Sayville
- Telephone Communication Service & Phone Companies, Sayville - Local & Long Distance Telephone Service
- Tent Rentals, Sayville
- Theatrical Producers & Services, Sayville
- Tires - Wholesale & Retail, Sayville
- Title & Surety Insurance, Sayville
- Toner Cartridges Refurbishing Services, Sayville
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- Tourist Attractions, Sayville
- Toy Stores, Sayville
- Tractors Equipment & Supplies, Sayville
- Transportation, Sayville
- Transportation Equipment Manufacturers, Sayville
- Transportation Facilities & Services, Sayville
- Transportation Rental & Leasing, Sayville
- Travel & Tourism, Sayville
- Travel Arrangement & Services, Sayville
- Truck Rental & Leasing, Sayville - Rent a Truck & Tractor
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Sayville - Collection, Removal, Disposal, Recycling, etc
- Trust And Will Attorneys & Lawyers, Sayville
- Trust And Will Lawyers & Attorneys, Sayville
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