Mill Creek Township, Mercer County, Pennsylvania

As of the census[6] of 2000, there were 639 people, 243 households, and 185 families residing in the township.

The population density was 33.7 inhabitants per square mile (13.0/km2).

There were 265 housing units at an average density of 14.0/sq mi (5.4/km2).

There were 243 households, out of which 34.6% had children under the age of 18 living with them, 65.8% were married couples living together, 7.8% had a female householder with no husband present, and 23.5% were non-families.

20.2% of all households were made up of individuals, and 8.6% had someone living alone who was 65 years of age or older.