- Talent Agencies & Casting Services, Foothill Ranch
- Talent Agents & Managers, Foothill Ranch
- Tanks Truck Transportation, Foothill Ranch
- Tax Return Preparation, Foothill Ranch
- Telecommunications, Foothill Ranch
- Telecommunications Companies, Businesses & Services, Foothill Ranch
- Television Programs Producers & Distributors, Foothill Ranch
- Testing Laboratories, Foothill Ranch - Lab Tests
- Textiles & Textile Finishing, Foothill Ranch
- Thai Restaurants, Foothill Ranch
- Thrift Stores, Resale & Consignment Shops, Foothill Ranch
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- Tires - Wholesale & Retail, Foothill Ranch
- Title Companies, Foothill Ranch - Title Search, Service & Abstract Company
- Tools & Hardware Supplies, Foothill Ranch
- Towing Service, Foothill Ranch
- Toy Stores, Foothill Ranch
- Transportation, Foothill Ranch
- Transportation Equipment And Supplies - Except Motor Vehicle, Foothill Ranch
- Transportation Rental & Leasing, Foothill Ranch
- Travel & Tourism, Foothill Ranch
- Travel Arrangement & Services, Foothill Ranch
- Tutoring Instructor, Foothill Ranch
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