Eureka is a city located in St. Louis County, Missouri, United States between the cities of St. Louis and Pacific along Interstate 44. As of the 2010 census, the city had a population of 10,189. Since 1971, Eureka has been known as the home of the amusement park Six Flags St. Louis (formerly Six Flags Over Mid-America). Local news coverage for the town and some of its neighbors is provided by the Tri County Journal, the Eureka Pacific Current NewsMagazine, and the Washington Missourian. The city is west of the former Times Beach, the site of dioxin contamination in the 1980s; the area was depopulated, cleaned up, and reopened as Route 66 State Park.