France is mainly divided into 18 administrative regions: 13 regions in metropolitan France (including the territorial collectivity of Corsica), and five located overseas. The regions are further subdivided into 101 departments, which are numbered mainly alphabetically. This number is used in postal codes and was formerly used on vehicle number plates. Among the 101 departments of France, five (French Guiana, Guadeloupe, Martinique, Mayotte, and Réunion) are in overseas regions (ROMs) that are also simultaneously overseas departments (DOMs), enjoy exactly the same status as metropolitan departments and are an integral part of the European Union. The 101 departments are subdivided into 335
Borough City, the word "borough" has resulted in a delegación (delegation), referring to the 16 administrative areas within the Mexican Federal District. Also the municipalities of some states are administratively subdivided into boroughs, as shown in Municipality of Mexicali#Boroughs. (see: Boroughs of Mexico and Municipalities of Mexico City) In the Netherlands, the municipalities of Rotterdam and Amsterdam are divided into administrative boroughs, or deelgemeenten, which have their own borough council and a borough mayor. Other large cities are usually divided into districts, or stadsdelen, for census purposes. New Zealand formerly used the term borough to designate self-governing towns of more than