Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Prospect Township is one of the fifteen townships of Marion County, Ohio, United States. The 2000 census found 2,207 people in the township, 1,016 of whom lived in the unincorporated portions of the township. The village of Prospect is located in southern Prospect Township. It is the only Prospect Township statewide.