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. The largest oil refinery in the United States, the Motiva Refinery, is located in Port Arthur.The population of Port Arthur was 53,818 at the 2010 census, down from 57,755 at the 2000 census. Early attempts at settlements in the area had all failed. 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.
Port Arthur is vulnerable to hurricanes and extensive damage to the city has been caused several times.