It is located on steep bluffs above the Meramec River. Tim Boyd founded Hidden Valley Ski Resort on the grounds of the Wildwood Golf Course in 1977. His Eurkea-based company Peak Resorts now operates a chain of ski resorts across the Midwest and Northeast United States.
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 as of 2004 is one of the oldest camps in the United States.
The railroad town of Allenton is a former community on U.S. Highway 66 located (now) at the junction of Interstate 44 and Business Loop 44 in western St. Louis County. In 1985 it was annexed by the city of Eureka. The town is currently rural, with adjacent farm land and forested Ozark ridges.
Allenton was declared blighted by St. Louis County, Missouri in 1973. Allenton and other parts of Eureka have become part of a $500 million redevelopment plan proposed by a partnership including The Jones Company and American Heritage Homes. The redevelopment proposal would include land and homes purchased by Eureka as part of a previously proposed redevelopment plan.
Eureka is the original home of Joe Boccardi's Ristorante and Eureka Wine House.
Eureka is the home to the last Six Flags to be built under the "Six Flags Over" name.
According to the United States Census Bureau, the city has a total area of 10.1 square miles (26.2 km²), of which, 10.1 square miles (26.0 km²) of it is land and 0.1 square miles (0.2 km²) of it is water. The total area is 0.59% water.
There are 2,487 households out of which half have children under the age of 18 living with them, 71.6% are married couples living together, 8.2% have a female householder with no husband present, and 17.0% are non-families. 13.8% of all households are made up of individuals and 4.3% have someone living alone who is 65 years of age or older. The average household size is 2.98 and the average family size is 3.30.
In the city the population is spread out with 31.9% under the age of 18, 5.7% from 18 to 24, 34.4% from 25 to 44, 19.5% from 45 to 64, and 8.5% who are 65 years of age or older. The median age is 34 years. For every 100 females there are 94.9 males. For every 100 females age 18 and over, there are 89.6 males.
The median income for a household in the city is $74,301, and the median income for a family is $80,625. Males have a median income of $51,799 versus $33,269 for females. The per-capita income for the city is $27,553. 2.2% of the population and 1.3% of families are below the poverty line. Out of the total population, 3.1% of those under the age of 18 and 5.9% of those 65 and older are living below the poverty line. The average home price in Eureka for 2008 was $315,000.