St. martinville is located in Iberia county Louisiana with a geographic area of 3.1 square miles. The total population in St. martinville is 5,844 with 50.1% male and 49.9% female. Children under age 5 represent 5.4% of the population, under age 18 equal 18.5% of the population and over age 65 is 24.1% of the population. The median household income is $30,530, per capita income is $23,345. There are a total of 2,458 housing units with 54.0% owner occupied. Education includes 53.3% of residents that are high school graduates and 11.0% with a bachelor's degree or higher. The average temperature in St. martinville in the summer is 81 degrees, and in the winter 51 degrees.