The Metropolitan City of Milan is a metropolitan city in the Lombardy region, Italy. Its capital is the city of Milan. It replaced the Province of Milan and includes the city of Milan and other 133 municipalities (comuni). It was first created by the reform of local authorities (Law 142/1990) and then established by the Law 56/2014. It has been since January 1, 2015. The Metropolitan City of Milan is headed by the Metropolitan Mayor (Sindaco metropolitano) and by the Metropolitan Council (Consiglio metropolitano).
The spatial spread of the Milan metropolitan area has greatly accelerated over recent decades. Since the 1960s, the growth of the numerous settlements around the core of the city has defined the extent and patterns of the metropolitan area, and commuting flows suggest that socioeconomic linkages have expanded even beyond the boundaries of the Metropolitan City. Competitiveness of Milan and its metropolitan area A single, large and increasingly widespread conurbation with the city of Milan at its hub defines the metropolitan area; however, its extent can vary greatly depending on the defining source. The Milan metropolitan area contains a population of 8,123,020 in 2013. The Milan metropolitan area is part of the so-called Blue Banana, the area of Europe with the highest population and industrial density.
Milan metropolitan area is one of southern Europe's key transport nodes and one of Italy's most important railway hubs. Its five major railway stations, among which the Milan Central station, are among Italy's busiest. The Azienda Trasporti Milanesi (ATM) operates within the metropolitan area, managing a public transport network consisting of an underground rapid transit network and tram, trolley-bus and bus lines. Overall the network covers nearly reaching 86 municipalities. Besides public transport, ATM manages the interchange parking lots and other transportation services including bike sharing and car sharing systems. Milan Metro is the rapid transit system serving the city, with 4 lines and a total length of more than . The recently opened M5 line is undergoing further expansion and the construction of the M4 line has been approved. The Milan suburban railway service comprises 10 lines and connects the metropolitan area with the city centre through the Milan Passerby underground railway. Commonly referred to as "Il Passante", it has a train running every 6 minutes (and in the city functions as a subway line with full transferability to the Milan Metro). The city tram network consists of approximately of track and 17 lines. Bus lines cover over . Milan has also taxi services operated by private companies and licensed by the City council of Milan. The city is also a key node for the national road network, being served by all the major highways of Northern Italy. Milan metropolitan area is served by two international airports. Malpensa International Airport, the second busiest in Italy is from central Milan and connected to the city by the "Malpensa Express" railway service. Linate Airport, which lies within the city limits, is mainly used for domestic and short-haul international flights, and served over 9 million passengers in 2010.