The township includes the census-designated place of Kapp Heights and surrounds, but excludes, the borough of Northumberland.

As of the census[5] of 2000, there were 3,722 people, 1,443 households, and 1,057 families residing in the township.

There were 1,523 housing units at an average density of 60.5 per square mile (23.4/km2).

There were 1,443 households, out of which 27.9% had children under the age of 18 living with them, 64.4% were married couples living together, 6.0% had a female householder with no husband present, and 26.7% were non-families.

21.6% of all households were made up of individuals, and 10.6% had someone living alone who was 65 years of age or older.