- Tanning Salons, Derry
- Tattooing, Derry
- Tax Preparations Electronic Filings, Derry
- Tax Return Preparation, Derry
- Tax Services, Derry
- Taxi Cab Service, Derry
- Taxi Service, Derry
- Telecommunications, Derry
- Telecommunications Companies, Businesses & Services, Derry
- Telephone Equipment & Systems - Repair & Service, Derry - Telecommunication Services
- Tent Rentals, Derry
- Terrazzo Tile Marble & Mosaic Contractors, Derry
- Testing Laboratories, Derry - Lab Tests
- Textile Machinery, Supplies & Equipment, Derry - Cutting Machine, Embroidery Machine, Sewing Supplies, etc
- Theater & Sport Ticket Agencies, Derry
- Thrift Stores, Resale & Consignment Shops, Derry
- Tile & Mosaics, Derry - Manufacturers & Distributors
- Tile Supplies, Derry - Tile Stores - Companies
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- Tires - Wholesale & Retail, Derry
- Title & Surety Insurance, Derry
- Tobacco Manufacturers, Derry
- Tobacco Products, Derry
- Tools & Hardware Supplies, Derry
- Towing Service, Derry
- Transmission Repair & Service, Derry
- Transportation, Derry
- Transportation Facilities & Services, Derry
- Transportation Rental & Leasing, Derry
- Travel & Tourism, Derry
- Tree & Shrub Transplanting & Removal, Derry
- Truck Rental & Leasing, Derry - Rent a Truck & Tractor
- Truck Repair & Service, Derry
- Truck Stops, Derry
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Derry - Collection, Removal, Disposal, Recycling, etc
- Tutoring Instructor, Derry
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