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is a second-ring suburb of St. Louis, located in northern St. Louis County, Missouri, United States. The population was 6,792 at the 2000 census. Its name comes from a grove of Blackjack oak trees that grew by the riverbank in its current location.
According to the United States Census Bureau, the city has a total area of 2.7 square miles (6.9 km²), of which, 2.7 square miles (6.9 km²) of it is land and 0.37% is water.