a surname; Piacenza (a province of Emilia-Romagna, Italy); Piacenza (the capital city of the province of Piacenza, Emilia-Romagna, Italy); a municipality of Papineau Regional County Municipality, Outaouais, Quebec, Canada
Poitou (a geographic region and former province of France, whose capital was Poitiers; now split between the administrative regions of Nouvelle-Aquitaine and Pays de la Loire)