Union Township is one of seventeen townships in Boone County, Iowa, USA. As of the 2000 census, its population was 503.
Union Township was organized in 1856.
Union Township covers an area of 36.22 square miles (93.8 km2) and contains one incorporated settlement, Berkley. According to the USGS, it contains two cemeteries: Fairview and Moore.
- ^ "US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.
- ^ "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- ^ Goldthwait, Nathan Edward (1914). History of Boone County, Iowa, Volume 1. Pioneer Publishing Company. p. 331.