- Tax Return Preparation, East Setauket
- Technical Consultants, East Setauket
- Technological Research & Development, East Setauket
- Technology Transfer Consultants, East Setauket
- Telecommunications, East Setauket
- Telecommunications Companies, Businesses & Services, East Setauket
- Telephone Equipment & Phone Systems, East Setauket - Sales, Service & Repair
- Television Stores & Dealers, East Setauket
- Tennis Courts, East Setauket
- Title & Surety Insurance, East Setauket
- Tobacco Products, East Setauket
- Tools & Hardware Supplies, East Setauket
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- Towing Service, East Setauket
- Toy Stores, East Setauket
- Transportation, East Setauket
- Transportation Equipment And Supplies - Except Motor Vehicle, East Setauket
- Transportation Facilities & Services, East Setauket
- Transportation Repair & Maintenance, East Setauket
- Travel & Tourism, East Setauket
- Travel Arrangement & Services, East Setauket
- Tree & Shrub Transplanting & Removal, East Setauket
- Truck Rental & Leasing, East Setauket - Rent a Truck & Tractor
- Tutoring Instructor, East Setauket
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