 rochester township is a township in beaver county, pennsylvania, united states. as of the 2010 census, it had a population of 2,802. ==geography== according to the united states census bureau, the township has a total area of , of which  is land and , or 1.66%, is water. ==demographics== as of the census of 2000, there were 3,129 people, 1,213 households, and 885 families residing in the township. the population density was 819.9 people per square mile (316.3/kmÂ²). there were 1,268 housing units at an average density of 332.3/sq&nbsp;mi (128.2/kmÂ²
Populated_places_established_in_1840 Townships_in_Beaver_County,_Pennsylvania