- Talent Agencies & Casting Services, Portsmouth
- Talent Agents & Managers, Portsmouth
- Tank & Pipe Contractors, Portsmouth
- Tank Cleaning & Draining , Portsmouth
- Tanks Abandonment Service, Portsmouth
- Tanning Salons, Portsmouth
- Tattooing, Portsmouth
- Tax Consultants, Portsmouth
- Tax Planning, Portsmouth
- Tax Preparations Electronic Filings, Portsmouth
- Tax Return Preparation, Portsmouth
- Tax Services, Portsmouth
- Taxi Cab Service, Portsmouth
- Taxi Service, Portsmouth
- Technical Consultants, Portsmouth
- Technological Research & Development, Portsmouth
- Technology Transfer Consultants, Portsmouth
- Telecommunications, Portsmouth
- Telecommunications Companies, Businesses & Services, Portsmouth
- Telecommunications Consultants, Portsmouth
- Teleconference Service, Equipment & Systems, Portsmouth
- Telemarketing Research & Selling Services, Portsmouth
- Telemarketing Services, Portsmouth
- Telephone Answering Service, Portsmouth - Messenger Services
- Telephone Communication Service & Phone Companies, Portsmouth - Local & Long Distance Telephone Service
- Telephone Equipment & Phone Systems, Portsmouth - Sales, Service & Repair
- Telephone Equipment & Systems - Repair & Service, Portsmouth - Telecommunication Services
- Telephone Wire & TV Cable Contractors, Portsmouth - Phone Jack - Wiring Installation
- Temp Agencies, Portsmouth
- Temporary & Contractor Agencies, Portsmouth
- Tent Rentals, Portsmouth
- Tents, Canopies & Awnings, Portsmouth
- Thai Restaurants, Portsmouth
- Theater & Theatrical Supplies & Equipment, Portsmouth - Stage Lighting, Stage Curtains, Sets, Costumes, etc
- Theatrical Producers & Services, Portsmouth
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- Thrift Stores, Resale & Consignment Shops, Portsmouth
- Tire Retread, Regroove & Repair Equipment, Portsmouth
- Tires - Wholesale & Retail, Portsmouth
- Title & Surety Insurance, Portsmouth
- Title Companies, Portsmouth - Title Search, Service & Abstract Company
- Tool & Die Makers, Portsmouth
- Tool & Machine Designers, Portsmouth
- Tools & Hardware Supplies, Portsmouth
- Tourist Attractions, Portsmouth
- Towing Service, Portsmouth
- Toy Stores, Portsmouth
- Traffic Control Services, Portsmouth
- Traffic Ticket Attorneys & Lawyers, Portsmouth - Traffic Violation
- Traffic Ticket Lawyers & Attorneys, Portsmouth - Traffic Violation
- Trailer Repair, Portsmouth - Travel, Utility, Cargo, Boat Trailer, etc
- Transcription Services, Portsmouth
- Transmission Repair & Service, Portsmouth
- Transportation, Portsmouth
- Transportation & Traffic Consultants & Services, Portsmouth - Transportation Brokers & Consultants
- Transportation Equipment Manufacturers, Portsmouth
- Transportation Facilities & Services, Portsmouth
- Transportation Programs Ports Ships & Boats, Portsmouth
- Transportation Rental & Leasing, Portsmouth
- Travel & Tourism, Portsmouth
- Travelers Checks & Money Order Services, Portsmouth
- Trinity Church, Portsmouth
- Trophies, Plaques & Awards, Portsmouth
- Truck & Van Accessories & Customizing Supplies, Portsmouth
- Truck Rental & Leasing, Portsmouth - Rent a Truck & Tractor
- Truck Repair & Service, Portsmouth
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Portsmouth - Collection, Removal, Disposal, Recycling, etc
- Tugboat & Towing Service, Portsmouth
- Tutoring Instructor, Portsmouth
- TV Stations & Broadcasting Companies, Portsmouth - Cable TV Networks, Talk Shows, etc
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