Charter oak is located in Crawford county Iowa with a geographic area of 0.5 square miles. The total population in Charter oak is 570 with 52.5% male and 47.5% female. Children under age 5 represent 7.2% of the population, under age 18 equal 29.5% of the population and over age 65 is 24.6% of the population. The median household income is $41,719, per capita income is $21,199. There are a total of 217 housing units with 65.9% owner occupied. Education includes 37.8% of residents that are high school graduates and 6.0% with a bachelor's degree or higher. The average temperature in Charter oak in the summer is 73 degrees, and in the winter 23 degrees.