- Tax Return Preparation, Leander
- Technological Research & Development, Leander
- Telecommunications, Leander
- Telephone Equipment & Phone Systems, Leander - Sales, Service & Repair
- Telephone Wire & TV Cable Contractors, Leander - Phone Jack - Wiring Installation
- Tennis Courts, Leander
- Terrazzo Tile Marble & Mosaic Contractors, Leander
- Thrift Stores, Resale & Consignment Shops, Leander
- Tile Contractors - Install & Repair, Leander - Ceramic & Porcelain Tile Flooring - Kitchen & Bathroom
- Tire Retread, Regroove & Repair Equipment, Leander
- Tires - Wholesale & Retail, Leander
- Tools & Hardware Supplies, Leander
- Tourist Attractions, Leander
- Tower & Power Line Contractors, Leander
- Towers Buildings & Antennas, Leander
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- Towing Service, Leander
- Toy Stores, Leander
- Trailer Rental & Leasing, Leander
- Transcription Services, Leander
- Transportation, Leander
- Transportation Equipment And Supplies - Except Motor Vehicle, Leander
- Transportation Facilities & Services, Leander
- Transportation Rental & Leasing, Leander
- Travel & Tourism, Leander
- Tree & Shrub Transplanting & Removal, Leander
- Trenching Contractors, Leander - Trencher - Excavation Contractors
- Truck Rental & Leasing, Leander - Rent a Truck & Tractor
- Truck Repair & Service, Leander
- Trust Companies, Leander
- Tutoring Instructor, Leander
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