August A. Busch Memorial Conservation Area

Weldon Spring Ordnance Works (WSOW) was a 17,323-acre (70.10 km2) U.S. Government-owned, contractor-operated (GOCO) facility in St. Charles County, Missouri, 55 km west of St. Louis. The site was originally operated by the Atlas Powder Company during World War II from 1941 to 1945 to produce explosives. The Atomic Energy Commission acquired part of the property in 1955, and Mallinckrodt, Inc. processed uranium ore from 1957 to 1966 under contract. The site has been divided into several parcels, and ownership has transferred over the years. Two portions of the original WSOW property are now Superfund sites that require substantial cleanup efforts. The environmental remediation of the WSOW site is currently designated as a major project of the Defense Environmental Restoration Program of the United States Department of Defense. Part of the original property is still used by the Army Reserve as the Weldon Spring Training Area.

Toonerville is an unincorporated community in St. Charles County, in the U.S. state of Missouri.

Francis Howell High School is a four-year public high school located in St. Charles, Missouri. Approximately 1800 students from Defiance, Foristell, New Melle, O'Fallon, Saint Peters, Saint Charles, Weldon Spring, and Wentzville attend school at Howell. It is in the Francis Howell School District. The school's mascot is Victor the Viking.

Dardenne Prairie is a city in St. Charles County, Missouri, United States. The population was 12,743 at the 2020 census.

The Weldon Spring Conservation Area, is a 8,398-acre (33.99 km2) conservation area that is owned and managed by the Missouri Department of Conservation and located in St. Charles County, Missouri. The area borders the Missouri River, and the Katy Trail runs through the area but is not considered part of the conservation area.

Mechanicsville is an unincorporated community in St. Charles County, in the U.S. state of Missouri.

Liberty High School is the third high school built in the Wentzville School District in Missouri, United States. The building opened for its first year in 2013. The enrollment for the first year was under 300 students, and consisted of a freshman class due to graduate in May 2017. Liberty has now grown to all grade levels.

Hamburg was a small town in St. Charles County, Missouri, United States. Hamburg was one of three towns, along with nearby Howell and Toonerville, that were evacuated and terminated in 1940–1941 when the area was taken over by the United States Department of the Army for the Weldon Spring Ordnance Works, which manufactured trinitrotoluene (TNT) and dinitrotoluene (DNT) and later processed uranium.

Wolf-Ruebeling House was a historic home near Defiance, St. Charles County, Missouri. It was built between about 1857 and 1859, and was a two-story, vernacular style brick I-house with Classical Revival style design references.: 2–3  It was destroyed in a 1985 fire.It was added to the National Register of Historic Places in 1983 and delisted in 1994.

Femme Osage Creek is a stream in St. Charles County in the U.S. state of Missouri. It is a tributary of the Missouri River.The stream headwaters arise just west of Missouri Route T and the stream flows initially west then turns north past the Femme Osage community on route T then turns to the east. The stream flows parallel to Missouri Route F past the Daniel Boone Home north of Schluersburg. It flows under Missouri Route 94 north of Defiance and enters the Missouri just south of the community of Hamburg within the Weldon Springs Conservation Area.Femme Osage is a name derived from French meaning "Osage woman". It is unclear why the name Femme Osage was applied to this stream. Many variant names have been recorded, including "Faim of the Hoozaw River", "Femme Osage River", "Osage Womans River", and "Wife of Osage River".

Weldon Springs is a spring in the city of Weldon Spring, in the U.S. state of Missouri.Weldon Springs has the name of John and Joseph Weldon, pioneer citizens.

Weldon Spring Heights is a small village in St. Charles County, Missouri, United States, approximately 30 miles west of St. Louis. According to the 2020 census, the population was 93.