Hayes Township is one of eighteen townships in Buena Vista County, Iowa, USA. As of the 2000 census, its population was 1,144.
Hayes Township covers an area of 33.37 square miles (86.4 km2) and contains one incorporated settlement, Lakeside. According to the USGS, it contains two cemeteries: Hayes Township and Saint Marys.
- ^ "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.