Black Jack is a second-ring suburb of St. Louis, located in northern St. Louis County, Missouri, United States. The population was 6,929 at t…Black Jack is a second-ring suburb of St. Louis, located in northern St. Louis County, Missouri, United States. The population was 6,929 at the 2010 census. A post office called Black Jack was established in 1872, and operated until 1906. The community was named for a grove of blackjack oak trees near the original town site.
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