After nearly 3 months in Portland, here’s what I know about the PDX public transit system… — The Portland public transport system also known as “The TriMet” covers approximately 533 miles and as the name implies, covers 3 metropolitan areas: Multnomah, Washington, and Clackamas. My TriMet experience focused on the southwest area of the system. Because I stayed in Beaverton (southwest of Portland), I only used a small section of the TriMet system.