Spencer is located in Mccook county South dakota with a geographic area of 0.3 square miles. The total population in Spencer is 132 with 49.2% male and 50.8% female. Children under age 5 represent 1.5% of the population, under age 18 equal 17.4% of the population and over age 65 is 34.8% of the population. The median household income is $50,313, per capita income is $30,792. There are a total of 61 housing units with 85.2% owner occupied. Education includes 59.0% of residents that are high school graduates and 1.6% with a bachelor's degree or higher. The average temperature in Spencer in the summer is 70 degrees, and in the winter 15 degrees.