Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Harrison Township is one of the twenty townships of Darke County, Ohio, United States. The 2000 census found 2,145 people in the township, 1,300 of whom lived in the unincorporated portions of the township. Two incorporated villages are located in Harrison Township: Hollansburg in the northwest, and part of New Madison in the east. It is one of nineteen Harrison Townships statewide.