- Tanning Salons, South Lyon
- Tax Return Preparation, South Lyon
- Taxi Cab Service, South Lyon
- Taxi Service, South Lyon
- Telecommunications, South Lyon
- Telephone Communication Service & Phone Companies, South Lyon - Local & Long Distance Telephone Service
- Telephone Equipment & Phone Systems, South Lyon - Sales, Service & Repair
- Telephone Wire & TV Cable Contractors, South Lyon - Phone Jack - Wiring Installation
- Television Equipment & Systems Dealers, South Lyon
- Television Stores & Dealers, South Lyon
- Tent Rentals, South Lyon
- Terrazzo Tile Marble & Mosaic Contractors, South Lyon
- Testing Laboratories, South Lyon - Lab Tests
- Textiles & Textile Finishing, South Lyon
- Thrift Stores, Resale & Consignment Shops, South Lyon
- Tile Contractors - Install & Repair, South Lyon - Ceramic & Porcelain Tile Flooring - Kitchen & Bathroom
- Tile Supplies, South Lyon - Tile Stores - Companies
- Tire Repair, Recapping & Retread, South Lyon
- Tires - Wholesale & Retail, South Lyon
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- Title & Surety Insurance, South Lyon
- Tools & Hardware Supplies, South Lyon
- Tourist Attractions, South Lyon
- Towing Service, South Lyon
- Toy Models Manufacturers, South Lyon
- Toy Stores, South Lyon
- Toys & Sporting Goods, South Lyon
- Tractors Equipment & Supplies, South Lyon
- Training Centers, South Lyon
- Transportation, South Lyon
- Transportation & Traffic Consultants & Services, South Lyon - Transportation Brokers & Consultants
- Transportation Facilities & Services, South Lyon
- Travel & Tourism, South Lyon
- Travel Arrangement & Services, South Lyon
- Tree & Shrub Transplanting & Removal, South Lyon
- Truck Rental & Leasing, South Lyon - Rent a Truck & Tractor
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, South Lyon - Collection, Removal, Disposal, Recycling, etc
- Tutoring Instructor, South Lyon
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