Letcher is located in Sanborn county South dakota with a geographic area of 0.6 square miles. The total population in Letcher is 191 with 48.7% male and 51.3% female. Children under age 5 represent 7.3% of the population, under age 18 equal 26.2% of the population and over age 65 is 5.2% of the population. The median household income is $56,016, per capita income is $25,807. There are a total of 83 housing units with 74.7% owner occupied. Education includes 38.6% of residents that are high school graduates and 19.3% with a bachelor's degree or higher. The average temperature in Letcher in the summer is 70 degrees, and in the winter 15 degrees.