[2] It is believed that Israel Inman was the first white settler in the township.

Logging was a major industry in the area due to the abundance of trees.

A vast majority of Dennison Township is made up of thick forests.

The Lehigh River forms the township's southeastern border.

Nescopeck State Park makes up the western part of the township.

At the 2000 census there were 908 people, 375 households, and 255 families living in the township.

Dennison Township is part of Crestwood School District.