Port Arthur is a city in the U.S. state of Texas, 90 mi (140 km) east of Houston. Part of the Beaumont–Port Arthur metropolitan area, Port Arthur lies primarily in Jefferson County, with a small extension in Orange County. The largest oil refinery in the United States, the Motiva Refinery, is located there. The population of Port Arthur was 53,818 at the 2010 census, down from 57,755 at the 2000 census. By 2020, its population had rebounded to 56,039. 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 tropical cyclones and the city has been extensively damaged by tropical cyclones several times.