  salem township is a township in mercer county, pennsylvania, united states. the population was 769 at the 2000 census. ==geography== according to the united states census bureau, the township has a total area of 13.4&nbsp;square miles (34.6&nbsp;kmÂ²), of which, 13.3&nbsp;square miles (34.5&nbsp;kmÂ²) of it is land and 0.04&nbsp;square miles (0.1&nbsp;kmÂ²) of it (0.22%) is water. ==demographics== as of the census of 2000, there were 769 people, 295 households, and 225 families residing in the township. the population density was 57.7 people per square mile (22.3/kmÂ²). there were 313 housing units at an average density of 23.5/sq&nbsp;mi (9.1/kmÂ²). the racial makeup of the township was 98.70% white, 0.52% native american, 0.13% asian, 0.13% pacific islander, 0.13% from other races, and 0.39% from two or more races. [[hispanic (u
Townships_in_Mercer_County,_Pennsylvania Townships_in_Pennsylvania YoungstownaWarrenaBoardman,_OHaPA_metropolitan_area