- Tank & Pipe Contractors, North Highlands
- Tank & Pipe Working Industrial Equipment, North Highlands
- Tanks Installation, Repair & Removal, North Highlands - Water, Fuel & Septic Tank
- Tattooing, North Highlands
- Tax Preparations Electronic Filings, North Highlands
- Tax Return Preparation, North Highlands
- Tax Services, North Highlands
- Taxi Cab Service, North Highlands
- Taxi Service, North Highlands
- Telecommunications, North Highlands
- Telecommunications Consultants, North Highlands
- Telephone Wire & TV Cable Contractors, North Highlands - Phone Jack - Wiring Installation
- Television Equipment & Systems Dealers, North Highlands
- Television Stores & Dealers, North Highlands
- Tents, Canopies & Awnings, North Highlands
- Testing Laboratories, North Highlands - Lab Tests
- Thrift Stores, Resale & Consignment Shops, North Highlands
- Tire Repair, Recapping & Retread, North Highlands
- Tire Retread, Regroove & Repair Equipment, North Highlands
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- Tires - Wholesale & Retail, North Highlands
- Tools & Hardware Supplies, North Highlands
- Towing Service, North Highlands
- Trailer Rental & Leasing, North Highlands
- Trailer Repair, North Highlands - Travel, Utility, Cargo, Boat Trailer, etc
- Training Consultants, North Highlands
- Training Consultants, North Highlands
- Translators & Interpreters, North Highlands
- Transmission Repair & Service, North Highlands
- Transportation, North Highlands
- Transportation & Traffic Consultants & Services, North Highlands - Transportation Brokers & Consultants
- Transportation Equipment Manufacturers, North Highlands
- Transportation Facilities & Services, North Highlands
- Transportation Rental & Leasing, North Highlands
- Travel & Tourism, North Highlands
- Travel Arrangement & Services, North Highlands
- Tree & Shrub Transplanting & Removal, North Highlands
- Truck Rental & Leasing, North Highlands - Rent a Truck & Tractor
- Truck Repair & Service, North Highlands
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