Arnold is the largest city in Jefferson County, Missouri, United States. The population was 20,808 at the 2010 census. Geography
Arnold is located at 38°25′58″N 90°22′10″W (38.432753, -90.369393). According to the United States Census Bureau, the city has a total area of 11.94 square miles (30.92 km²), of which, 11.58 square miles (29.99 km²) is land and 0.36 square miles (0.93 km²) is water.
The city is located at the confluence of the Meramec River and the Mississippi River just south of St. Louis County.
The first European settler in Arnold was Jean Baptiste Gamache, who operated a ferry boat across the Meramec River in exchange for 1050 arpents of land granted by the King of Spain. This ferry was on the King's Trace or El Camino Real, from St. Louis, Missouri, to Ste. Genevieve, Missouri.
As of the census of 2010, there were 20,808 people, 8,090 households, and 5,695 families residing in the city. The population density was 1,796.9 inhabitants per square mile (693.8/km²). There were 8,547 housing units at an average density of 738.1 per square mile (285.0/km²). The racial makeup of the city was 96.3% White, 0.6% African American, 0.2% Native American, 0.9% Asian, 0.6% from other races, and 1.4% from two or more races. Hispanic or Latino of any race were 2.2% of the population.
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