- Tanning Salons, Willis
- Tax Return Preparation, Willis
- Tax Services, Willis
- Telecommunications, Willis
- Telephone Communication Service & Phone Companies, Willis - Local & Long Distance Telephone Service
- Telephone Equipment & Phone Systems, Willis - Sales, Service & Repair
- Telephone Equipment & Systems - Repair & Service, Willis - Telecommunication Services
- Temperature Measuring Materials, Willis
- Tennis Clubs, Willis
- Thrift Stores, Resale & Consignment Shops, Willis
- Tires - Wholesale & Retail, Willis
- Title & Surety Insurance, Willis
- Towing Service, Willis
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- Tractors Equipment & Supplies, Willis
- Trailer Rental & Leasing, Willis
- Transportation, Willis
- Transportation & Traffic Consultants & Services, Willis - Transportation Brokers & Consultants
- Transportation Facilities & Services, Willis
- Transportation Rental & Leasing, Willis
- Travel & Tourism, Willis
- Travel Arrangement & Services, Willis
- Tree & Shrub Transplanting & Removal, Willis
- Trees & Shrubs Retail, Willis
- Truck Campers & Camper Shells, Willis - Truck Caps, Toppers, Bed Covers, Tonneau Covers, etc
- Truck Rental & Leasing, Willis - Rent a Truck & Tractor
- Truck Stops, Willis
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