Dardenne Prairie is a city in St. Charles County, Missouri, United States. The population was 11,494 at the 2010 census.
Dardenne Prairie is located southwest of O'Fallon on Missouri Route N just east of US Route 40. According to the United States Census Bureau, the city has a total area of 4.92 square miles (12.74 km²), all of it land.
As of the census of 2010, there were 11,494 people, 3,670 households, and 3,208 families residing in the city. The population density was 2,336.2 inhabitants per square mile (902.0/km²). There were 3,768 housing units at an average density of 765.9 per square mile (295.7/km²). The racial makeup of the city was 90.7% White, 3.5% African American, 0.1% Native American, 3.5% Asian, 0.5% from other races, and 1.6% from two or more races. Hispanic or Latino of any race were 2.0% of the population.
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