Smithville is located in Bastrop county Texas with a geographic area of 4.0 square miles. The total population in Smithville is 4,501 with 50.4% male and 49.6% female. Children under age 5 represent 5.9% of the population, under age 18 equal 18.9% of the population and over age 65 is 21.0% of the population. The median household income is $56,968, per capita income is $34,030. There are a total of 1,711 housing units with 75.0% owner occupied. Education includes 28.7% of residents that are high school graduates and 25.5% with a bachelor's degree or higher. The average temperature in Smithville in the summer is 83 degrees, and in the winter 49 degrees.