Saratoga Township is one of seventeen townships in Grundy County, Illinois, USA. As of the 2020 census, its population was 6,342 and it contained 2,681 housing units. According to the 2021 census gazetteer files, Saratoga Township has a total area of 36.23 square miles, of which 36.00 square miles is land and 0.23 square miles is water.