Chesterfield is a city in St. Louis County, Missouri, United States, and a Western suburb of St. Louis. As of the 2010 census, the population was 47,484, making it the state's fourteenth-largest city.
The broader valley of Chesterfield was originally referred to as "Gumbo Flats", derived from its soil, which though very rich and silty, became like a gumbo when wet. Geographically, Chesterfield is half the size of St. Louis.
Chesterfield is located about 25 miles (40 km) west of St. Louis, Missouri. According to the United States Census Bureau, the city has a total area of 33.52 square miles (86.82 km²), of which, 31.78 square miles (82.31 km²) is land and 1.74 square miles (4.51 km²) is water.
Portions of Chesterfield are located in the floodplain of the Missouri River, now known as Chesterfield Valley, formerly Gumbo Flats. This area was submerged during the Great Flood of 1993; higher levees built since then have led to extensive commercial development in the valley. Chesterfield Valley is the location of Spirit of St. Louis Airport, used for corporate aviation, as well as the longest outdoor strip mall in America. The remainder of Chesterfield is located on the bluffs above the floodplain, and includes residential and retail development. Chesterfield is also home to several mid- to high-rise buildings, the tallest being the Drury Plaza Hotel, which is 12 stories and 125 feet tall.
According to the 2007–2011 American Community Survey estimate, the median income for a household in the city was $95,006, and the median income for a family was $88,568. Males had a median income of $94,322 versus $54,934 for females. The per capita income for the city was $51,725. About 1.7% of families and 4.0% of the population were below the poverty line, including 1.7% of those under age 18 and 3.3% of those age 65 or over.
As of the census of 2010, there were 47,484 people, 19,224 households, and 13,461 families residing in the city. The population density was 1,494.1 inhabitants per square mile (576.9/km²). There were 20,393 housing units at an average density of 641.7 per square mile (247.8/km²). The racial makeup of the city was 86.5% White, 2.6% African American, 0.2% Native American, 8.6% Asian, 0.7% from other races, and 1.4% from two or more races. Hispanic or Latino of any race were 2.8% of the population.
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