- T-Shirt Manufacturers, Millersville
- Tax Return Preparation, Millersville
- Taxi Cab Service, Millersville
- Taxi Service, Millersville
- Technological Research & Development, Millersville
- Telecommunications, Millersville
- Telecommunications Companies, Businesses & Services, Millersville
- Telephone Communication Service & Phone Companies, Millersville - Local & Long Distance Telephone Service
- Telephone Equipment & Phone Systems, Millersville - Sales, Service & Repair
- Telephone Equipment & Systems - Repair & Service, Millersville - Telecommunication Services
- Television Stores & Dealers, Millersville
- Temp Agencies, Millersville
- Temporary & Contractor Agencies, Millersville
- Terrazzo Tile Marble & Mosaic Contractors, Millersville
- Testing Laboratories, Millersville - Lab Tests
- Textile Machinery, Supplies & Equipment, Millersville - Cutting Machine, Embroidery Machine, Sewing Supplies, etc
- Textiles & Textile Finishing, Millersville
- Theater & Sport Ticket Agencies, Millersville
- Thrift Stores, Resale & Consignment Shops, Millersville
- Tires - Wholesale & Retail, Millersville
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- Title & Surety Insurance, Millersville
- Title Companies, Millersville - Title Search, Service & Abstract Company
- Tobacco Products, Millersville
- Tools & Hardware Supplies, Millersville
- Towing Service, Millersville
- Trailer Hitch, Millersville - Accessories, Parts, Installation, etc
- Trailer Rental & Leasing, Millersville
- Training & Seminars - Program Designing & Development, Millersville
- Training Consultants, Millersville
- Training Programs Designing & Development, Millersville - Training Consultants
- Transplant Services, Millersville
- Transportation, Millersville
- Transportation Rental & Leasing, Millersville
- Travel & Tourism, Millersville
- Trophies Manufacturers, Millersville
- Truck Rental & Leasing, Millersville - Rent a Truck & Tractor
- Truck Repair & Service, Millersville
- Truck Stops, Millersville
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Millersville - Collection, Removal, Disposal, Recycling, etc
- Typing & Word Processing Services, Millersville
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