Hillsdale is located in St. louis county Missouri with a geographic area of 0.3 square miles. The total population in Hillsdale is 1,029 with 45.1% male and 54.9% female. Children under age 5 represent 14.8% of the population, under age 18 equal 41.0% of the population and over age 65 is 6.6% of the population. The median household income is $28,661, per capita income is $12,851. There are a total of 359 housing units with 32.6% owner occupied. Education includes 33.1% of residents that are high school graduates and 14.8% with a bachelor's degree or higher. The average temperature in Hillsdale in the summer is 77 degrees, and in the winter 32 degrees.