From the Wikipedia page 
Freguesia (Portuguese pronunciation: [ˌfɾɛɣɨˈzi.ɐ]), usually translated as "parish" or "civil parish", is the third-level administrative subdivision of Portugal, as defined by the 1976 Constitution. It is also a local administrative unit in the former Portuguese overseas territories of Cape Verde and Macau. In the past, was also an administrative division of the other Portuguese overseas territories. The parroquia in the Spanish autonomous communities of Galicia and Asturias is similar to a freguesia.
A freguesia is a subdivision of a município (municipality). Most often, a parish takes the name of its seat, which is usually the most important (or the single) human agglomeration within its area, which can be a neighbourhood or city district, a group of hamlets, a village, a town or an entire city. In cases where the seat is itself divided into more than one parish, each one takes the name of a landmark within its area or of the patron saint from the usually coterminous Catholic parish (paróquia in Portuguese). Be it a city district or village, the civil parish is often based on an ecclesiastical parish.
Since the creation of a democratic local administration, in 1976, the Portuguese parishes have been ruled by a system composed by an executive body (the junta de freguesia, "parish board") and a deliberative body (the assembleia de freguesia, "parish assembly"). The members of the assembleia de freguesia are publicly elected every four years. The presidents of the parish boards are also members of the municipal assembly.