- Tanning Salons, South Portland
- Tax Return Preparation, South Portland
- Tax Services, South Portland
- Taxi Cab Service, South Portland
- Taxi Service, South Portland
- Technological Research & Development, South Portland
- Telecommunications, South Portland
- Telecommunications Companies, Businesses & Services, South Portland
- Telephone Answering Service, South Portland - Messenger Services
- Telephone Communication Service & Phone Companies, South Portland - Local & Long Distance Telephone Service
- Telephone Equipment & Phone Systems, South Portland - Sales, Service & Repair
- Telephones On Hold Audio Services, South Portland
- Temp Agencies, South Portland
- Temporary & Contractor Agencies, South Portland
- Tent Rentals, South Portland
- Testing Laboratories, South Portland - Lab Tests
- Textile Machinery, Supplies & Equipment, South Portland - Cutting Machine, Embroidery Machine, Sewing Supplies, etc
- Thai Restaurants, South Portland
- Theater & Sport Ticket Agencies, South Portland
- Thrift Stores, Resale & Consignment Shops, South Portland
- Tires - Wholesale & Retail, South Portland
- Title & Surety Insurance, South Portland
- Title Companies, South Portland - Title Search, Service & Abstract Company
- Tools & Hardware Supplies, South Portland
- Tours & Guide Services, South Portland
- Tower & Power Line Contractors, South Portland
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- Towers Buildings & Antennas, South Portland
- Towers Communications, South Portland
- Towing Equipment, South Portland
- Towing Service, South Portland
- Toy Stores, South Portland
- Trailer Hitch, South Portland - Accessories, Parts, Installation, etc
- Trailer Rental & Leasing, South Portland
- Transcribing Service, Tape, Disc, Etc, South Portland - Transcriber
- Transcription Services, South Portland
- Transportation, South Portland
- Transportation & Traffic Consultants & Services, South Portland - Transportation Brokers & Consultants
- Transportation Equipment Manufacturers, South Portland
- Transportation Facilities & Services, South Portland
- Transportation Rental & Leasing, South Portland
- Travel & Tourism, South Portland
- Travel Arrangement & Services, South Portland
- Truck Campers & Camper Shells, South Portland - Truck Caps, Toppers, Bed Covers, Tonneau Covers, etc
- Truck Refrigeration Equipment & Repair, South Portland
- Truck Rental & Leasing, South Portland - Rent a Truck & Tractor
- Truck Repair & Service, South Portland
- Truck Trailers Parts & Dealers, South Portland
- Truck Wash & Cleaning Service, South Portland
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, South Portland - Collection, Removal, Disposal, Recycling, etc
- Trust And Will Attorneys & Lawyers, South Portland
- Trust And Will Lawyers & Attorneys, South Portland
- Tutoring Instructor, South Portland
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