Avondale is a city in Clay County, Missouri, United States.

[6] Avondale is the birthplace of World War Two hero Carl Beck.

According to the United States Census Bureau, the city has a total area of 0.14 square miles (0.36 km2), all land.

There were 226 housing units at an average density of 1,614.3 per square mile (623.3/km2).

30.2% of all households were made up of individuals, and 9% had someone living alone who was 65 years of age or older.

There were 224 housing units at an average density of 1,692.2 per square mile (653.4/km2).

22.8% of all households were made up of individuals, and 5.5% had someone living alone who was 65 years of age or older.