Big Sandy is a town in Upshur County, Texas, United States. As of the 2010 census, the town's population was 1,343. A lake of the same name is cut nearly in half by U.S. Highway 80, the main thoroughfare of Big Sandy. It lies directly west of the larger cities of Gladewater and Longview.
The Sabine River flows just south of Big Sandy. In the 19th century, Walters' Bluff Ferry operated on the Sabine, with passage across costing 40 cents per person and up to 75 cents for wagons.
Big Sandy is located at 32°35′5″N 95°6′44″W (32.584693, -95.112297).
According to the United States Census Bureau, the town has a total area of 1.7 square miles (4.3 km2), of which, 1.6 square miles (4.2 km2) of it is land and 0.04 square miles (0.1 km2) of it (1.80%) is water.
As of the census of 2000, there were 1,288 people, 532 households, and 342 families residing in the town. The population density was 786.8 people per square mile (303.2/km2). There were 595 housing units at an average density of 363.4/sq mi (140.1/km2). The racial makeup of the town was 81.75% White, 12.89% African American, 0.39% Native American, 1.16% Asian, 2.95% from other races, and 0.85% from two or more races.