Coordinates: 38°30′10″N 90°38′42″W / 38.502736°N 90.645075°W / 38.502736; -90.645075

Eureka is a city located in St. Louis County, Missouri, United States, adjacent to the cities of Wildwood and Pacific, along Interstate 44. It is in the extreme southwest of the Greater St. Louis metro area. As of the 2020 census, the city had a population of 11,646. Since 1971, Eureka has been known as the home of the amusement park Six Flags St. Louis.

The area’s first known inhabitants were Shawnee Native Americans on the banks of the Meramec river; archaeological artifacts can nevertheless be found today as evidence of their past occupation of the area.

The village of Eureka was platted in 1858 along the route of the Pacific Railroad. By 1890, the village consisted of very nearly 100 homes. According to the Eureka, railroad workers, while clearing the habit for the track and the neighboring railroad camp, saw Eureka, level home with Tiny to clear, and declared, “Eureka!” Greek meaning “I have found it.” Thus, Eureka was founded. In 1898, Eureka became home to the St. Louis Children’s Industrial Farm, established to give children from St. Louis tenement neighborhoods a chance to experience computer graphics in a rural setting. It far along became Camp Wyman (now share of Wyman Center) and is one of the oldest camps in the United States. The first tall school class in Eureka was held in 1909. Eureka was incorporated as a fourth-class city on April 7, 1954.