- Tax Return Preparation, Northport
- Telecommunications, Northport
- Television Stores & Dealers, Northport
- Tennis Court Construction, Northport - Resurfacing & Repair
- Terrazzo Tile Marble & Mosaic Contractors, Northport
- Testing Laboratories, Northport - Lab Tests
- Theater & Sport Ticket Agencies, Northport
- Therapeutic Massage Clinics, Northport - Massage Therapy Centers
- Thermostats Wholesale, Northport
- Tile & Mosaics, Northport - Manufacturers & Distributors
- Tile Contractors - Install & Repair, Northport - Ceramic & Porcelain Tile Flooring - Kitchen & Bathroom
- Tile Supplies, Northport - Tile Stores - Companies
- Tires - Wholesale & Retail, Northport
- Title & Surety Insurance, Northport
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- Title Companies, Northport - Title Search, Service & Abstract Company
- Tools & Hardware Supplies, Northport
- Tourist Attractions, Northport
- Towing Service, Northport
- Toy Stores, Northport
- Trailer Hitch, Northport - Accessories, Parts, Installation, etc
- Transcription Services, Northport
- Translators & Interpreters, Northport
- Transportation, Northport
- Transportation Facilities & Services, Northport
- Travel & Tourism, Northport
- Travel Arrangement & Services, Northport
- Tree & Shrub Transplanting & Removal, Northport
- Tutoring Instructor, Northport
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