The Township of Mattawan is located 5 minutes north of Mattawa in the Nipissing District. It can be accessed by Highway 533, with Highway 656 as a branch which leads you to the Otto Holden Generating Station.

The first white settlers to arrive in this area was in the 1850s. The township was incorporated in the early 1880s. They were lumbermen who came to work for the Booth Lumber Company or farmers that wanted to work the land and sell their surplus to the lumber company.

Many lumberman stayed and brought their families. In 1948 there was an influx of new immigrants to this region because of the construction of the Otto Holden Generating Station. This brought many people by train to this
area and many stayed and made this township grow.