Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Waterloo Township is one of the fourteen townships of Athens County, Ohio, United States. The 2000 census found 2,605 people in the township. No municipalities are located in Waterloo Township, although three unincorporated communities lie in the township: New Marshfield in the center, Carbondale in the township''s northwest, and Mineral in the west-center of the township. It is the only Waterloo Township statewide.