Avondale is located in Clay county Missouri with a geographic area of 0.1 square miles. The total population in Avondale is 494 with 47.4% male and 52.6% female. Children under age 5 represent 2.8% of the population, under age 18 equal 21.7% of the population and over age 65 is 17.0% of the population. The median household income is $43,889, per capita income is $25,569. There are a total of 222 housing units with 70.3% owner occupied. Education includes 19.8% of residents that are high school graduates and 22.1% with a bachelor's degree or higher. The average temperature in Avondale in the summer is 77 degrees, and in the winter 32 degrees.