Garnavillo Township is a township in Clayton County, Iowa, USA. As of the 2000 census, its population was 1,008.GeographyGarnavillo Township covers an area of 33.13sqmi and contains one incorporated settlement, Garnavillo. According to the USGS, it contains six cemeteries: Ceres, Garnavillo, Jenkins, McClelland, Saint Joseph and Saint Joseph.The stream of West Branch South Cedar Creek runs through this township.