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is a town in Upshur County, Texas, United States. The population was 1,288 at the 2000 census. Since it is the only "wet city" in Upshur County, Smith and Wood County residents often come to Big Sandy to purchase beer, wine, and liquor.
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.