Eagle Township is one of seventeen rural townships in Black Hawk County, Iowa, United States. As of the 2000 census, its population was 511. Eagle Township was organized in 1858. Eagle Township covers an area of 36.62 square miles and contains no incorporated settlements. According to the USGS, it contains two cemeteries: Eagle and Saint …Eagle Township is one of seventeen rural townships in Black Hawk County, Iowa, United States. As of the 2000 census, its population was 511. Eagle Township was organized in 1858. Eagle Township covers an area of 36.62 square miles and contains no incorporated settlements. According to the USGS, it contains two cemeteries: Eagle and Saint Mary's of Mount Carmel.