Politically, Northern Portugal is divided into 86 municipalities ("municípios"), which in turn are subdivided into 1,426 civil parishes ("freguesias"). The region was subdivided in supramunicipal districts in 1835. Northern Portugal includes the districts of Viana do Castelo, Braga, Porto, Vila Real, and Bragança, and partly the districts of Aveiro, Viseu, and Guarda. The largest urbanized localities with city status, some of which can be suburbs, are Porto (237,584), Vila Nova de Gaia (186,503), Braga (143,532), Guimarães (66,912), Rio Tinto (64,815), Matosinhos (49,486), Póvoa de Varzim (42,396), Maia (40,134), Ermesinde (38,798), and Vila Real (38,045), according to a 2004 survey.