Rochester Township is a township in Beaver County, Pennsylvania.

As of the census of 2000, there were 3,129 people, 1,213 households, and 885 families residing in the township.
According to the United States Census Bureau, the township has a total area of 3.9 square miles, of which,
3.8 square miles of it is land and 0.1 square miles of it (1.29%) is water.

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