Port Arthur is a city in Jefferson County within the Beaumont–Port Arthur metropolitan area of the U.S. state of Texas. A small, uninhabited portion extends into Orange County. It is 90 mi (140 km) east of Houston. It is host to the largest oil refinery in the United States (the 600,000 bpd Saudi Aramco – Motiva Enterprises refinery).
However, in 1895, Arthur Stilwell founded Port Arthur, and the town quickly grew. Port Arthur was incorporated as a city in 1898 and soon developed into a seaport. It eventually became the center of a large oil refinery network. The Rainbow Bridge across the Neches River connects Port Arthur to Bridge City.