Marlborough 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 0.23 square miles (0.60 km2), all land.

There were 1,456 housing units at an average density of 6,330.4 per square mile (2,444.2/km2).

57.7% of all households were made up of individuals, and 7.4% had someone living alone who was 65 years of age or older.

There were 1,422 housing units at an average density of 6,253.9 per square mile (2,414.6/km2).

58.3% of all households were made up of individuals, and 8.2% had someone living alone who was 65 years of age or older.