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is a city located in St. Louis County, Missouri, United States, between St. Louis and Pacific along Interstate 44. As of the 2000 census, the city had a total population of 7,676.
It is two miles (3 km) west of the former site of Times Beach, the site of dioxin contamination discovered in the 1980s; the area was cleaned up and became Route 66 State Park.
Since 1961, Eureka is best known in the region as the home of the amusement park formerly known as Six Flags Over Mid-America and now called Six Flags St. Louis.
The village of Eureka was platted in 1858 along the route of the Pacific Railroad. By 1890, the village consisted of about 100 homes.
According to the Eureka Chamber of Commerce, railroad workers while clearing way for the track and the next railroad camp saw Eureka, level land with little 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 life in a rural setting. It later became known as Camp Wyman, now a part of Wyman Center, and is one of the oldest camps in the United States.