- Tax Preparations Electronic Filings, Portland
- Tax Return Preparation, Portland
- Tax Services, Portland
- Telecommunications, Portland
- Telephone Communication Service & Phone Companies, Portland - Local & Long Distance Telephone Service
- Temp Agencies, Portland
- Temporary & Contractor Agencies, Portland
- Testing Laboratories, Portland - Lab Tests
- Thrift Stores, Resale & Consignment Shops, Portland
- Tires - Wholesale & Retail, Portland
- Title & Surety Insurance, Portland
- Title Companies, Portland - Title Search, Service & Abstract Company
- Tool & Die Makers Equipment & Supplies, Portland
- Tools & Hardware Supplies, Portland
- Tourists Information & Attractions, Portland
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- Towing Service, Portland
- Trade Shows, Expositions & Fairs, Portland
- Trailer Parks & Campsites, Portland
- Transportation, Portland
- Transportation Facilities & Services, Portland
- Transportation Medical Non Emergency, Portland
- Transportation Rental & Leasing, Portland
- Travel & Tourism, Portland
- Travel Arrangement & Services, Portland
- Trenching Contractors, Portland - Trencher - Excavation Contractors
- Truck Campers & Camper Shells, Portland - Truck Caps, Toppers, Bed Covers, Tonneau Covers, etc
- Truck Rental & Leasing, Portland - Rent a Truck & Tractor
- Truck Repair & Service, Portland
- Trust And Will Attorneys & Lawyers, Portland
- Trust And Will Lawyers & Attorneys, Portland
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