The railroad town of Allenton is a former community on U.S. Highway 66. It is now located at the junction of Interstate 44 and Business Loop 44 in western St. Louis County, Missouri. It was annexed by Eureka in 1985.
The town is predominantly rural and has farmlands. Allenton is part of a $500 million redevelopment plan proposed by a partnership for Eureka and its constituent towns.
Allenton's population as of 2011 is 13,608.
The population predominantly comprises White Americans. A small percentage of the population comprises African Americans and people of Hispanic origin.