- Tax Return Preparation, East Alton
- Tax Services, East Alton
- Telecommunications, East Alton
- Testing Laboratories, East Alton - Lab Tests
- Tires - Wholesale & Retail, East Alton
- Title Companies, East Alton - Title Search, Service & Abstract Company
- Tools & Hardware Supplies, East Alton
- Towing Service, East Alton
- Trailer Rental & Leasing, East Alton
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