- Tanning Salons, Middlefield
- Tax Return Preparation, Middlefield
- Technological Research & Development, Middlefield
- Telecommunications, Middlefield
- Tent Rentals, Middlefield
- Testing Laboratories, Middlefield - Lab Tests
- Thrift Stores, Resale & Consignment Shops, Middlefield
- Timber Industry Professionals, Middlefield
- Timberland & Timberland Companies, Middlefield
- Tires - Wholesale & Retail, Middlefield
- Title Companies, Middlefield - Title Search, Service & Abstract Company
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- Tools & Hardware Supplies, Middlefield
- Tourists Information & Attractions, Middlefield
- Towing Service, Middlefield
- Tractors Equipment & Supplies, Middlefield
- Trailer Rental & Leasing, Middlefield
- Transportation, Middlefield
- Transportation Rental & Leasing, Middlefield
- Truck Rental & Leasing, Middlefield - Rent a Truck & Tractor
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Middlefield - Collection, Removal, Disposal, Recycling, etc
- Trust And Will Attorneys & Lawyers, Middlefield
- Trust And Will Lawyers & Attorneys, Middlefield
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