Eldorado Township is one of twenty townships in Benton County, Iowa, United States. As of the 2000 census, its population was 1,240.

According to the United States Census Bureau, Eldorado Township covers an area of 35.6 square miles (92.21 square kilometers).

• Newhall

• Eden Township (north)
• Canton Township (northeast)
• Fremont Township (east)
• Florence Township (southeast)
• St. Clair Township (south)
• Leroy Township (southwest)
• Union Township (west)
• Big Grove Township (northwest)

The township contains these three cemeteries: Prairie Lutheran, Saint Johns Lutheran and Salem.

• U.S. Route 30
• U.S. Route 218

• Benton Community School District

• Iowa's 3rd congressional district
• State House District 39
• State Senate District 20

• United States Census Bureau 2007 TIGER/Line Shapefiles
• United States Board on Geographic Names (GNIS)
• United States National Atlas

• US-Counties.com
• City-Data.com