Fenton is a city in St. Louis County, Missouri, United States and a suburb of St. Louis. The population was 4,022 at the 2010 census.
Due to its proximity to fertile land and the Meramec River, the Fenton area has been inhabited for over 900 years. The earliest proof of ancient dwellers was excavated from the "Fenton Mounds", two conical, earthen burial mounds located near the southwestern border of Fenton. Diagnostic pottery shards from the mounds indicate they date from the Mississippian times, A.D. 1050 - 1400. In 2001, the mounds were leveled for construction of a Walmart Supercenter.
The Fenton territory was occupied by Native Americans and early settlers in the 1770s. William Lindsay Long founded the city of Fenton on March 23, 1818. The original eight square block area is now referred to as "Old Towne Fenton".