- Tanning Salons, Houlton
- Tattooing, Houlton
- Tax Return Preparation, Houlton
- Taxi Cab Service, Houlton
- Taxi Service, Houlton
- Technological Research & Development, Houlton
- Telecommunications, Houlton
- Television Stores & Dealers, Houlton
- Testing Laboratories, Houlton - Lab Tests
- Theater & Sport Ticket Agencies, Houlton
- Thrift Stores, Resale & Consignment Shops, Houlton
- Timber Industry Professionals, Houlton
- Tire Repair, Recapping & Retread, Houlton
- Tires - Wholesale & Retail, Houlton
- Tools & Hardware Supplies, Houlton
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- Tourists Information & Attractions, Houlton
- Tractors Equipment & Supplies, Houlton
- Trading Posts, Houlton
- Transportation, Houlton
- Transportation & Traffic Consultants & Services, Houlton - Transportation Brokers & Consultants
- Transportation Facilities & Services, Houlton
- Transportation For Handicapped & Elderly, Houlton - Senior & Disabled
- Transportation Repair & Maintenance, Houlton
- Travel & Tourism, Houlton
- Travel Arrangement & Services, Houlton
- Tribal Government, Houlton
- Truck Repair & Service, Houlton
- Truck Stops, Houlton
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Houlton - Collection, Removal, Disposal, Recycling, etc
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