- Tank Cleaning & Draining , Katonah
- Taxi Cab Service, Katonah
- Taxi Service, Katonah
- Telephone Communication Service & Phone Companies, Katonah - Local & Long Distance Telephone Service
- Terrazzo Tile Marble & Mosaic Contractors, Katonah
- Textiles & Textile Finishing, Katonah
- Tile Contractors - Install & Repair, Katonah - Ceramic & Porcelain Tile Flooring - Kitchen & Bathroom
- Title & Surety Insurance, Katonah
- Title Companies, Katonah - Title Search, Service & Abstract Company
- Tools & Hardware Supplies, Katonah
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- Tourist Attractions, Katonah
- Towing Service, Katonah
- Toy Stores, Katonah
- Tractor Repair & Service, Katonah
- Tractors Equipment & Supplies, Katonah
- Transportation, Katonah
- Transportation Facilities & Services, Katonah
- Travel & Tourism, Katonah
- Travel Arrangement & Services, Katonah
- Tutoring Instructor, Katonah
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