Henderson is located in St. martin county Louisiana with a geographic area of 3.0 square miles. The total population in Henderson is 2,261 with 54.6% male and 45.4% female. Children under age 5 represent 5.4% of the population, under age 18 equal 22.1% of the population and over age 65 is 19.4% of the population. The median household income is $25,870, per capita income is $16,348. There are a total of 739 housing units with 79.3% owner occupied. Education includes 48.0% of residents that are high school graduates and 0.9% with a bachelor's degree or higher. The average temperature in Henderson in the summer is 81 degrees, and in the winter 51 degrees.