Arnold is the largest city in Jefferson County, Missouri, United States. The population was estimated to be 20,603 in 2008, slightly more than the 19,965 number reported in the 2000 census. Arnold is located at 38°25′58″N 90°22′10″W / 38.43278°N 90.36944°W / 38.43278; -90.36944 . According to the United States Census Bureau, the city has a total area of 11.6 square miles , of which, 11.2 square miles of it is land and 0.3 square miles of it is water. 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. Arnold was a focal point over the eminent domain issue in Missouri. In January 2004, the City of Arnold announced that THF Realty had approached them regarding developing a section of Arnold known as the Triangle, an area bordered by Route 141, Interstate 55, and Church Road in the city limits.
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| County: | Jefferson County |
| State: | Missouri |
| Country: | United States of America |
| Population: | 20,609 |
| Area: | 11.6 sq. mi. |
| Time zone: | Central Time zone |
| Also known as: | Arnold, Missouri, Jefferson County / Arnold city |