Denville is known as the “Hub of Morris County” for its location along major transportation routes at the center of the county. Denville was formed as a township by an Act of the New Jersey Legislature on April 14, 1913, from portions of Rockaway Township.
The township has an approximate total area of 12.641 square miles 11.867 square miles of it is land and 0.774 square miles of it is water. There are approximately 16,635 people, 6,432 households, and 4,509 families residing in the township.
Denville has 11 named bodies of water within township limits. The four major residential lake communities are Cedar Lake, Indian Lake, Rock Ridge, and Lake Arrowhead (including Great Bay and Bay of Deep Waters). Estling Lake is a private summer community, which has some full year residents. The three minor lakes are Cooper Lake, Hollstein Lake, and Openaki Lake. The town also has Cooks Pond, a recreational lake available for public use by membership.