 The Township was named in honor of Judge Daniel Westbrook Dingman, and was created on April 17, 1832 from part of the former Upper Smithfield township.The Callahan House, Minisink Archeological Site, and Gifford Pinchot House are listed on the National Register of Historic Places.According to the United States Census Bureau, the township has a total area of , of which, of it is land and of it (2.92%) is water.