Hillsdale is a village in St. Louis County, Missouri, United States.

[4] According to the United States Census Bureau, the village has a total area of 0.35 square miles (0.91 km2), all land.

There were 696 housing units at an average density of 1,988.6 per square mile (767.8/km2).

24.2% of all households were made up of individuals, and 6.2% had someone living alone who was 65 years of age or older.

There were 645 housing units at an average density of 1,845.6 per square mile (712.6/km2).

26.5% of all households were made up of individuals, and 7.6% had someone living alone who was 65 years of age or older.

The Hillsdale Police Department is responsible for law enforcement services in the village.