St. Ann or Saint Ann is a city in northwest St. Louis County, Missouri, United States. The population was 13,019 at the 2020 census. The ci…St. Ann or Saint Ann is a city in northwest St. Louis County, Missouri, United States. The population was 13,019 at the 2020 census. The city was established in 1948 but began to develop six years before it was granted the petition of incorporation. Charles F. Vatterott, the developer and builder of most of the residential and commercial properties in St. Ann, started the community as a housing project for families of workers employed in nearby defense plants. It was one of the few defense housing projects in the country to develop into a permanent town. The original homesite was dedicated in honor of Saint Ann, the mother of the Virgin Mary.
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