Porteño (feminine: porteña) in
Spanish is used to refer to a person who is from or lives in a port city, but it can also be used as an adjective for anything related to those port cities.
The largest city to which the term is commonly applied is
Argentina, and since the end of the 19th century Porteños has come to be a name (or
demonym) for the people from that city.
 As a result of great
immigration waves from Europe peaking in the 1880s, the
Río de la Plata area, and in particular
Buenos Aires and
Montevideo, are mostly populated with people of European descent, mainly
Italian. In contrast, inland Argentina, especially the Northwest, has had less European immigration and retains more white
Chile, porteño/a is commonly used for residents of
Costa Rica, porteño/a is commonly used for people from the province of
Puntarenas in the Pacific Coast.