High Quality Content by WIKIPEDIA articles! Walnut Township is a township in Butler County, Kansas, USA. As of the 2000 census, its population was 760.Walnut Township covers an area of 35.88 square miles (92.9 km2) and contains no incorporated settlements. According to the USGS, it contains three cemeteries: Fairview, Golden and Little Walnut.The stream of Fourmile Creek runs through this township.Butler County (county code BU) is a county located in South Central Kansas, in the Central United States. The county's population was estimated to be 63,147 in the year 2006, making it the eighth largest in the state. Its county seat and most populous city is El Dorado. The county is a part of the Wichita Metropolitan Statistical Area.