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.
Chesterfield is located approximately 25 miles (40 km) west of St. Louis. According to the United States Census Bureau, the city has a total area of 33.52 square miles (86.82 km), of which 31.78 square miles (82.31 km) is land and 1.74 square miles (4.51 km) is water.
Portions of Chesterfield are located in the floodplain of the Missouri River, now known as Chesterfield Valley, formerly as 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.
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/km). There were 20,393 housing units at an average density of 641.7 per square mile (247.8/km). 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.
There were 19,224 households of which 29.3% had children under the age of 18 living with them, 62.2% were married couples living together, 5.9% had a female householder with no husband present, 2.0% had a male householder with no wife present, and 30.0% were non-families. 26.1% of all households were made up of individuals and 11.6% had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 2.94.
The median age in the city was 46.6 years. 22.3% of residents were under the age of 18; 5.7% were between the ages of 18 and 24; 19.5% were from 25 to 44; 32.5% were from 45 to 64; and 20.1% were 65 years of age or older. The gender makeup of the city was 47.8% male and 52.2% female.
As of the census of 2000, there were 46,802 people, 18,060 households, and 13,111 families residing in the city. The population density was 1,485.4 people per square mile (573.5/km²). There were 18,738 housing units at an average density of 594.7 per square mile (229.6/km²). The racial makeup of the city was 92.30% White, 0.86% African American, 0.12% Native American, 5.56% Asian, 0.02% Pacific Islander, 0.39% from other races, and 0.74% from two or more races. Hispanic or Latino of any race were 1.55% of the population.
There were 18,060 households out of which 33.2% had children under the age of 18 living with them, 65.5% were married couples living together, 5.4% had a female householder with no husband present, and 27.4% were non-families. 23.6% of all households were made up of individuals and 8.8% had someone living alone who was 65 years of age or older. The average household size was 2.53 and the average family size was 3.03.
In the city the population was spread out with 24.6% under the age of 18, 5.9% from 18 to 24, 25.0% from 25 to 44, 29.7% from 45 to 64, and 14.7% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 91.6 males. For every 100 females age 18 and over, there were 88.2 males.