 fairview is a borough in butler county, pennsylvania, united states. the population was 198 at the 2010 census. it should not be confused with fairview, erie county, pennsylvania, which carries the zip code 16415. ==geography== fairview is located in eastern butler county at  (41.015289, -79.743303). it is surrounded by fairview township but is separate from it. the borough of petrolia is  to the east. according to the
Boroughs_in_Butler_County,_Pennsylvania Boroughs_in_Pennsylvania Pittsburgh_metropolitan_area Populated_places_established_in_1830