Eureka is an unincorporated community in Cinque Hommes Township in Perry County, Missouri, United States.State Historical Society of Missouri: Perry County http://shs.umsystem.edu/manuscripts/ramsay/ramsay_perry.html Eureka lies approximately eight miles east of Perryville, and about one mile east of Longtown.A Directory of Towns, Villages, and Hamlets Past and Present of Perry County, Missouri http://thelibrary.org/lochist/moser/perrypl.html Eureka was named after the nearby school.
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