Smithville is a city in Bastrop County, Texas, United States, near the Colorado River. The population was 3,901 at the 2000 census. The population grew to an estimated 4,339 for 2004. Smithville was established in 1827, when Thomas Gazely settled in the area and operated a store. A community sprang up around the store, and it was named Smithville, in honor of another Early resident, William Smith. Gazely's store closed upon his death in 1853. According to the United States Census Bureau, the city has a total area of 3.5square miles (9.1Square kilometers), of which, 3.5square miles (9.1Square kilometers) of it is land and 0.04square miles (0.10Square kilometers) of it (0.85%) is water. Smithville is located at 12 miles southeast of Bastrop and 42miles southeast of Austin.