Eureka Township is one of the seventeen townships of Adair County, Iowa, United States. At the 2020 census, its population was 101. History Eureka Township was organized in 1870. "Eureka!" is said to have exclaimed by an early settler when he discovered coal within the township borders. It was served by Berea post office from 1894 to 1908, named after the Ancient Greek city of Berea. Geography According to the United States Census Bureau, Eureka Township covers an area of 35.59 square miles (92.19 square kilometers); of this, 0.05 square miles (0.13 square kilometers) or 0.14 percent is water. Cities Fontanelle Extinct towns Berea Cemeteries The township contains one cemetery, Eureka. Major highways Iowa Highway 92 Lakes Nodaway Lake Landmarks Ken Sidey Nature Area County Park Nodaway Park School districts Nodaway Valley Political districts Iowa's 4th congressional district State House District 58 State Senate District 29 References United States Census Bureau 2007 TIGER/Line Shapefiles United States Board on Geographic Names (GNIS) United States National Atlas External links US-Counties.com City-Data.com Townships in Adair County, Iowa Townships in Iowa 1870 establishments in Iowa Populated places established in 1870