- Tank & Pipe Contractors, Lockport
- Tanning Salons, Lockport
- Tax Return Preparation, Lockport
- Telephone Answering & Secretarial Service, Lockport
- Telephone Answering Service, Lockport - Messenger Services
- Telephone Communication Service & Phone Companies, Lockport - Local & Long Distance Telephone Service
- Telephone Directory Publishers, Lockport - Publishers - Directory & Guide
- Testing Laboratories, Lockport - Lab Tests
- Title & Surety Insurance, Lockport
- Tools & Hardware Supplies, Lockport
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- Tours & Guide Services, Lockport
- Towing Service, Lockport
- Transportation, Lockport
- Transportation Equipment Manufacturers, Lockport
- Transportation Facilities & Services, Lockport
- Transportation Rental & Leasing, Lockport
- Travel & Tourism, Lockport
- Travel Arrangement & Services, Lockport
- Truck Rental & Leasing, Lockport - Rent a Truck & Tractor
- Tugboat & Towing Service, Lockport
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