- Tanning Salons, Northfield
- Tattooing, Northfield
- Tax Preparations Electronic Filings, Northfield
- Tax Return Preparation, Northfield
- Tax Services, Northfield
- Taxi Cab Service, Northfield
- Taxi Service, Northfield
- Technological Research & Development, Northfield
- Teeth Whitening Products, Northfield
- Teeth Whitening Products & Services, Northfield
- Telecommunications Companies, Businesses & Services, Northfield
- Telephone Communication Service & Phone Companies, Northfield - Local & Long Distance Telephone Service
- Tires - Wholesale & Retail, Northfield
- Tools & Hardware Supplies, Northfield
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- Tourist Attractions, Northfield
- Tours & Guide Services, Northfield
- Towing Service, Northfield
- Toy Stores, Northfield
- Trailer Rental & Leasing, Northfield
- Transportation, Northfield
- Transportation Rental & Leasing, Northfield
- Travel & Tourism, Northfield
- Travel Arrangement & Services, Northfield
- Tropical & Saltwater Fish Stores, Northfield
- Truck Rental & Leasing, Northfield - Rent a Truck & Tractor
- Truck Repair & Service, Northfield
- Trust And Will Attorneys & Lawyers, Northfield
- Trust And Will Lawyers & Attorneys, Northfield
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