Portland is the largest and most populous city in the U.S. state of Oregon and the seat of Multnomah County. It is a major port in the Willamette Valley region of the Pacific Northwest, at the confluence of the Willamette and Columbia rivers in Northwestern Oregon. As of 2019, Portland had an estimated population of 654,741, making it the 26th most populated city in the United States, the sixth-most populous on the West Coast, and the second-most populous in the Pacific Northwest after Seattle. The city flag of Portland, Oregon, consists of a green field on which is placed a white four-pointed star (a truncated hypocycloid) from which radiate blue stripes, each bordered by L-shaped yellow elements. Narrow white fimbriations separate the blue and yellow elements from each other and from the green background. Full HD.