La Unión District may refer to: Peru: La Unión District, Piura, in Piura province, Piura region La Unión District, Dos de Mayo, in Dos de Mayo province, Huánuco region La Unión District, Tarma, in Tarma province, Junín region Costa Rica: La Unión District, Montes de Oro, in Montes de Oro Canton, Puntarenas province See also La Unión District name disambiguation pages