- Tax Return Preparation, South Houston
- Telecommunications, South Houston
- Teleconference Service, Equipment & Systems, South Houston
- Telegraph Companies & Services, South Houston
- Testing Laboratories, South Houston - Lab Tests
- Tire Repair, Recapping & Retread, South Houston
- Tires - Wholesale & Retail, South Houston
- Title & Surety Insurance, South Houston
- Title Companies, South Houston - Title Search, Service & Abstract Company
- Tool & Die Makers, South Houston
- Tool & Machine Designers, South Houston
- Tools & Hardware Supplies, South Houston
- Tours & Guide Services, South Houston
- Towing Service, South Houston
- Toy Stores, South Houston
- Traffic Signs, Signals & Equipment , South Houston
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- Trailer Parts & Equipment, South Houston
- Trailer Rental & Leasing, South Houston
- Trailer Repair, South Houston - Travel, Utility, Cargo, Boat Trailer, etc
- Training Human Resource Development, South Houston
- Translators & Interpreters, South Houston
- Transmission Repair & Service, South Houston
- Transportation, South Houston
- Transportation & Traffic Consultants & Services, South Houston - Transportation Brokers & Consultants
- Transportation Facilities & Services, South Houston
- Transportation Rental & Leasing, South Houston
- Travel & Tourism, South Houston
- Travel Arrangement & Services, South Houston
- Truck Campers & Camper Shells, South Houston - Truck Caps, Toppers, Bed Covers, Tonneau Covers, etc
- Truck Rental & Leasing, South Houston - Rent a Truck & Tractor
- Truck Repair & Service, South Houston
- Tube Cleaning & Expanding Equipment, South Houston
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