Irwin Township, Pennsylvania

According to the United States Census Bureau, the township has a total area of 30.1 square miles (78 km2), all land.

As of the census[4] of 2000, there were 1,309 people, 494 households, and 379 families residing in the township.

The population density was 43.4 inhabitants per square mile (16.8/km2).

There were 494 households, out of which 33.4% had children under the age of 18 living with them, 64.4% were married couples living together, 8.3% had a female householder with no husband present, and 23.1% were non-families.

20.2% of all households were made up of individuals, and 7.5% had someone living alone who was 65 years of age or older.