Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Cass Township is one of the eighteen townships of Richland County, Ohio, United States. It is a part of the Mansfield Metropolitan Statistical Area. The 2000 census found 1,735 people in the township, 1,014 of whom lived in the unincorporated portions of the township. Statewide, other Cass Townships are located in Hancock and Muskingum Counties.