St. Ann is a suburb of St. Louis in north St. Louis County, Missouri, United States. The population was 13,020 at the 2010 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.
St. Ann is located at 38°43′38″N 90°23′8″W (38.727184, -90.385515) in the north-central part of the St. Louis area. St. Ann also borders Lambert-St. Louis International Airport. Municipal neighbors to St. Ann are Bridgeton, Edmundson, Woodson Terrace, Breckenridge Hills, Overland, and a large portion of unincorporated St. Louis County that lies between Maryland Heights and Creve Coeur. According to the United States Census Bureau, the city has a total area of 3.18 square miles (8.24 km2), all land.At the 2010 census there were 13,020 people, 5,894 households, and 3,259 families living in the city. The population density was 4,094.3 inhabitants per square mile (1,580.8/km2).
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