- Talent Agencies & Casting Services, New Canaan
- Talent Agents & Managers, New Canaan
- Taxi Cab Service, New Canaan
- Taxi Service, New Canaan
- Telecommunications, New Canaan
- Telecommunications Companies, Businesses & Services, New Canaan
- Television Programs Producers & Distributors, New Canaan
- Tennis Courts, New Canaan
- Tennis Equipment & Supplies Stores, New Canaan - Racquets, Shoes, Balls, Bags, Clothing & Accessories
- Testing Laboratories, New Canaan - Lab Tests
- Theatrical Producers & Services, New Canaan
- Thrift Stores, Resale & Consignment Shops, New Canaan
- Title & Surety Insurance, New Canaan
- Title Companies, New Canaan - Title Search, Service & Abstract Company
- Tools & Hardware Supplies, New Canaan
- Tourist Attractions, New Canaan
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- Towing Service, New Canaan
- Toy Stores, New Canaan
- Transportation, New Canaan
- Transportation & Traffic Consultants & Services, New Canaan - Transportation Brokers & Consultants
- Transportation Equipment Manufacturers, New Canaan
- Transportation Rental & Leasing, New Canaan
- Travel & Tourism, New Canaan
- Travel Arrangement & Services, New Canaan
- Tree & Shrub Transplanting & Removal, New Canaan
- Tropical & Saltwater Fish Stores, New Canaan
- Truck Repair & Service, New Canaan
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, New Canaan - Collection, Removal, Disposal, Recycling, etc
- Trust And Will Attorneys & Lawyers, New Canaan
- Trust And Will Lawyers & Attorneys, New Canaan
- Tutoring Instructor, New Canaan
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