- Tank & Pipe Contractors, Duncanville
- Tanks Installation, Repair & Removal, Duncanville - Water, Fuel & Septic Tank
- Tapes Sound & Video, Duncanville
- Tarps, Duncanville - Tarpaulins
- Tax Return Preparation, Duncanville
- Tax Services, Duncanville
- Telecommunications, Duncanville
- Telecommunications Companies, Businesses & Services, Duncanville
- Telemarketing Equipment, Duncanville
- Telemarketing Services, Duncanville
- Telephone Answering & Secretarial Service, Duncanville
- Telephone Answering Service, Duncanville - Messenger Services
- Telephone Directory Publishers, Duncanville - Publishers - Directory & Guide
- Telephone Equipment & Phone Systems, Duncanville - Sales, Service & Repair
- Telephone Equipment & Systems - Repair & Service, Duncanville - Telecommunication Services
- Temp Agencies, Duncanville
- Temporary & Contractor Agencies, Duncanville
- Tents, Canopies & Awnings, Duncanville
- Textile & Apparel Services, Duncanville
- Theater & Sport Ticket Agencies, Duncanville
- Tire Retread, Regroove & Repair Equipment, Duncanville
- Tires - Wholesale & Retail, Duncanville
- Title & Surety Insurance, Duncanville
- Title Companies, Duncanville - Title Search, Service & Abstract Company
- Tool & Die Makers, Duncanville
- Tools & Hardware Supplies, Duncanville
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- Towing Service, Duncanville
- Trailer Parts & Equipment, Duncanville
- Trailers & Trailer Equipment Manufacturers, Duncanville
- Training & Seminars - Program Designing & Development, Duncanville
- Training Consultants, Duncanville
- Training Programs Designing & Development, Duncanville - Training Consultants
- Transmission Repair & Service, Duncanville
- Transportation, Duncanville
- Transportation & Traffic Consultants & Services, Duncanville - Transportation Brokers & Consultants
- Transportation Equipment Manufacturers, Duncanville
- Transportation Facilities & Services, Duncanville
- Transportation Inspection Services, Duncanville
- Transportation Rental & Leasing, Duncanville
- Transportation Service Permit, Duncanville
- Travel & Tourism, Duncanville
- Travel Arrangement & Services, Duncanville
- Tropical & Saltwater Fish Stores, Duncanville
- Tropical Foliage Service, Duncanville
- Truck & Van Accessories & Customizing Supplies, Duncanville
- Truck Bedliners, Duncanville
- Truck Driver Leasing, Duncanville
- Truck Permit Service, Duncanville
- Truck Refrigeration Equipment & Repair, Duncanville
- Truck Rental & Leasing, Duncanville - Rent a Truck & Tractor
- Truck Repair & Service, Duncanville
- Tutoring Instructor, Duncanville
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