St. charles is located in Bear lake county Idaho with a geographic area of 0.7 square miles. The total population in St. charles is 160 with 55.0% male and 45.0% female. Children under age 5 represent 8.8% of the population, under age 18 equal 22.5% of the population and over age 65 is 33.8% of the population. The median household income is $68,500, per capita income is $35,489. There are a total of 72 housing units with 86.1% owner occupied. Education includes 9.7% of residents that are high school graduates and 6.9% with a bachelor's degree or higher. The average temperature in St. charles in the summer is 65 degrees, and in the winter 24 degrees.