Mendon Township is a township in Clayton County, Iowa, USA. As of the 2000 census, its population was 1,890.GeographyMendon Township covers an area of 33.7sqmi and contains two incorporated settlements: Marquette and McGregor. According to the USGS, it contains ten cemeteries: Baylis, Buell Park, Eastman, First Evangelical Lutheran, Knapp, Moody, Pleasant Grove, Point Ann, Saint Marys Catholic and Walton.The streams of Bloody Run and North Cedar Creek run through this township.