The MAX Orange Line is a light rail service in Portland, Oregon, United States, operated by TriMet as part of the MAX Light Rail system. It connects Portland City Center to Portland State University (PSU), Southeast Portland, Milwaukie, and Oak Grove. The Orange Line starts near Portland Union Station heading southbound within downtown Portland along the Portland Transit Mall on 5th Avenue. From the transit mall, it continues along the Portland–Milwaukie Light Rail segment, which runs through the South Waterfront, across the Willamette River into Southeast Portland, then south to Oak Grove, just outside Milwaukie proper in unincorporated Clackamas County. The line serves 17 stations from Union Station/Northwest 5th & Glisan to and runs for 20 hours daily with a minimum headway of 15 minutes during most of the day.