- Talent Agencies & Casting Services, Port Jefferson Station
- Talent Agents & Managers, Port Jefferson Station
- Tax Return Preparation, Port Jefferson Station
- Taxi Cab Service, Port Jefferson Station
- Taxi Service, Port Jefferson Station
- Telecommunications, Port Jefferson Station
- Telephone Communication Service & Phone Companies, Port Jefferson Station - Local & Long Distance Telephone Service
- Tent Rentals, Port Jefferson Station
- Tents, Canopies & Awnings, Port Jefferson Station
- Testing Calibration & Gauge Testing Labs, Port Jefferson Station
- Testing Laboratories, Port Jefferson Station - Lab Tests
- Thai Restaurants, Port Jefferson Station
- Tile Supplies, Port Jefferson Station - Tile Stores - Companies
- Tire & Related Products Manufacturers, Port Jefferson Station
- Tire Retread, Regroove & Repair Equipment, Port Jefferson Station
- Tires - Wholesale & Retail, Port Jefferson Station
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- Title & Surety Insurance, Port Jefferson Station
- Title Companies, Port Jefferson Station - Title Search, Service & Abstract Company
- Tools & Hardware Supplies, Port Jefferson Station
- Tourist Attractions, Port Jefferson Station
- Towing Service, Port Jefferson Station
- Toy Stores, Port Jefferson Station
- Transportation, Port Jefferson Station
- Transportation Equipment Manufacturers, Port Jefferson Station
- Transportation Rental & Leasing, Port Jefferson Station
- Travel & Tourism, Port Jefferson Station
- Travel Arrangement & Services, Port Jefferson Station
- Truck Rental & Leasing, Port Jefferson Station - Rent a Truck & Tractor
- Truck Repair & Service, Port Jefferson Station
- Trust And Will Attorneys & Lawyers, Port Jefferson Station
- Trust And Will Lawyers & Attorneys, Port Jefferson Station
- Tutoring Instructor, Port Jefferson Station
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