Wentzville is a suburb of St. Louis that is located in western St. Charles County, Missouri, United States. As of the 2010 census, the city had a total population of 29,070. 2017 population estimates have placed the city's population at 39,414, making it the 16th largest city in Missouri. Wentzville was the fastest growing city in Missouri between 2000 and 2010, and population estimates since 2010 indicate that Wentzville is likely to continue as the state's fastest growing city for a second consecutive decade. As the site of the county fairgrounds, Wentzville hosts the annual St. Gerard County Parade (also known as the "Black Parade"), St. Lazlo Wentz Festival and the Greater St. Louis Renaissance Faire.
Wentzville is located at 38°48'58" North, 90°51'26" West (38.816010, −90.857198). According to the United States Census Bureau, the city has a total area of 19.98 square miles (51.75 km²), of which, 19.96 square miles (51.70 km²) is land and 0.02 square miles (0.05 km²) is water.
As of the census of 2010, there were 29,070 people, 9,767 households, and 7,852 families residing in the city. The population density was 1,456.4 inhabitants per square mile (562.3/km²). There were 10,305 housing units at an average density of 516.3 per square mile (199.3/km²). The racial makeup of the city was 89.9% White, 6.0% African American, 0.3% Native American, 1.2% Asian, 0.8% from other races, and 1.9% from two or more races. Hispanic or Latino of any race were 2.7% of the population.
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