[2] The township was named for O. F. Forsyth, general agent for a mining firm in the area.

[1] As of the census[3] of 2000, there were 4,824 people, 2,022 households, and 1,429 families residing in the township.

There were 3,846 housing units at an average density of 22.0 per square mile (8.5/km2).

There were 2,022 households, out of which 29.9% had children under the age of 18 living with them, 57.3% were married couples living together, 8.2% had a female householder with no husband present, and 29.3% were non-families.

25.6% of all households were made up of individuals, and 8.6% had someone living alone who was 65 years of age or older.