Hermosa is located in Custer county South dakota with a geographic area of 0.5 square miles. The total population in Hermosa is 407 with 54.5% male and 45.5% female. Children under age 5 represent 1.5% of the population, under age 18 equal 18.2% of the population and over age 65 is 17.7% of the population. The median household income is $67,545, per capita income is $30,376. There are a total of 175 housing units with 83.4% owner occupied. Education includes 42.3% of residents that are high school graduates and 16.6% with a bachelor's degree or higher. The average temperature in Hermosa in the summer is 70 degrees, and in the winter 15 degrees.
