St. peters is located in St. charles county Missouri with a geographic area of 22.5 square miles. The total population in St. peters is 57,536 with 47.6% male and 52.4% female. Children under age 5 represent 6.0% of the population, under age 18 equal 22.5% of the population and over age 65 is 16.3% of the population. The median household income is $80,119, per capita income is $37,956. There are a total of 22,766 housing units with 82.5% owner occupied. Education includes 18.7% of residents that are high school graduates and 41.7% with a bachelor's degree or higher. The average temperature in St. peters in the summer is 77 degrees, and in the winter 32 degrees.