Orange is a city and the county seat of Orange County, Texas, United States. As of the 2010 census, the city population was 18,595. It is the easternmost city in Texas, located on the Sabine River at the border with Louisiana, and is 113 miles from Houston. Orange is part of the Beaumont−Port Arthur Metropolitan Statistical Area. Founded in 1836, it is a deep-water port to the Gulf of Mexico.