- Tanning Salons, Londonderry
- Tax Preparations Electronic Filings, Londonderry
- Tax Return Preparation, Londonderry
- Tax Services, Londonderry
- Taxi Cab Service, Londonderry
- Taxi Service, Londonderry
- Technological Research & Development, Londonderry
- Telecommunications, Londonderry
- Telephone Answering Service, Londonderry - Messenger Services
- Telephone Equipment & Phone Systems, Londonderry - Sales, Service & Repair
- Temp Agencies, Londonderry
- Temperature Controlled Containers, Londonderry
- Temporary & Contractor Agencies, Londonderry
- Testing Calibration & Gauge Testing Labs, Londonderry
- Testing Laboratories, Londonderry - Lab Tests
- Textile & Apparel Services, Londonderry
- Thrift Stores, Resale & Consignment Shops, Londonderry
- Tires - Wholesale & Retail, Londonderry
- Title & Surety Insurance, Londonderry
- Title Companies, Londonderry - Title Search, Service & Abstract Company
- Title Service, Londonderry
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- Tool & Die Makers, Londonderry
- Tools & Hardware Supplies, Londonderry
- Towing Service, Londonderry
- Trailer Rental & Leasing, Londonderry
- Transmission Repair & Service, Londonderry
- Transportation, Londonderry
- Transportation Equipment And Supplies - Except Motor Vehicle, Londonderry
- Transportation Facilities & Services, Londonderry
- Transportation Rental & Leasing, Londonderry
- Transportation Repair & Maintenance, Londonderry
- Travel & Tourism, Londonderry
- Truck Campers & Camper Shells, Londonderry - Truck Caps, Toppers, Bed Covers, Tonneau Covers, etc
- Truck Refrigeration Equipment & Repair, Londonderry
- Truck Rental & Leasing, Londonderry - Rent a Truck & Tractor
- Truck Repair & Service, Londonderry
- Truck Trailers Parts & Dealers, Londonderry
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Londonderry - Collection, Removal, Disposal, Recycling, etc
- Trust And Will Attorneys & Lawyers, Londonderry
- Trust And Will Lawyers & Attorneys, Londonderry
- Trust Companies, Londonderry
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