The Pittsburgh Bureau of Fire (PBF) provides fire suppression and prevention for the City of Pittsburgh, as well as BLS response on medical details. In all, the bureau is responsible for 55.5 square miles (144 km2) with a population of 305,841 as of the 2013 Census estimation. The Bureau was the first fire department in the United States to unionize and thus has the International Association of Fire Fighters (IAFF) local number of 1. Source: Wikipedia