[3] The bridge between Madison and Mahoning Townships and Colwell Cut Viaduct are listed on the National Register of Historic Places.

[4] Mahoning Township appears in the 1876 Atlas of Armstrong County, Pennsylvania.

[7] Pennsylvania State Game Lands Number 137 is located in the northern portion of Mahoning Township, just outside of South Bethlehem near Redbank Creek.

[9][10] As of the 2000 census,[12] there were 1,502 people, 607 households, and 449 families residing in the township.

22.7% of all households were made up of individuals, and 12.0% had someone living alone who was 65 years of age or older.