- Tanning Salons, Somerville
- Tax Return Preparation, Somerville
- Tax Services, Somerville
- Telephone Communication Service & Phone Companies, Somerville - Local & Long Distance Telephone Service
- Textile Machinery, Supplies & Equipment, Somerville - Cutting Machine, Embroidery Machine, Sewing Supplies, etc
- Timber Industry Professionals, Somerville
- Time & Temperature, Somerville
- Tires - Wholesale & Retail, Somerville
- Title Companies, Somerville - Title Search, Service & Abstract Company
- Tools & Hardware Supplies, Somerville
- Towing Service, Somerville
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- Tractors Equipment & Supplies, Somerville
- Trailer Rental & Leasing, Somerville
- Transmission Repair & Service, Somerville
- Transportation, Somerville
- Transportation & Traffic Consultants & Services, Somerville - Transportation Brokers & Consultants
- Transportation Equipment Manufacturers, Somerville
- Transportation Facilities & Services, Somerville
- Transportation Rental & Leasing, Somerville
- Travel & Tourism, Somerville
- Truck Rental & Leasing, Somerville - Rent a Truck & Tractor
- Truck Trailers Parts & Dealers, Somerville
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