View of Piazza del Duomo (from the top of the Duomo - Milan)

Piazza del Duomo ("Cathedral Square") is the main piazza (city square) of Milan, Italy. It is named after, and dominated by, the Milan Cathedral (the Duomo). The piazza marks the center of the city, both in a geographic sense and because of its importance from an artistic, cultural, and social point of view. Rectangular in shape, with an overall area of 17.000 m² (about 183.000 Sq Ft), the piazza includes some of the most important buildings of Milan (and Italy in general), as well some of the most prestigious commercial activities, and it is by far the foremost tourist attraction of the city.

While the piazza was originally created in the 14th century and has been gradually developing ever since (along with the Duomo, that took about 6 centuries to complete), its overall plan, in its current form, is largely due to architect Giuseppe Mengoni, and dates back to the second half of the 19th century. The monumental buildings that mark its sides, with the main exception of the Duomo itself and the Royal Palace, were introduced by Mengoni's design; the most notable of Mengoni's addition to the piazza is the Galleria Vittorio Emanuele II arcade.

The origins of Piazza del Duomo can be traced back to the vision of Azzone Visconti (lord of Milan from 1329 to 1339). In 1330, Azzone ordered the demolition of the taverns that circled the two central churches of Milan of the time, the Basilica di Santa Maria Maggiore and the Basilica of Santa Tecla, to create a market square, called "Piazza dell'Arengo", which is the first incarnation of what is now Piazza del Duomo. The piazza was named after the arengario (also known as the "broletto"), i.e., the seat of the local government. None of the original buildings of Piazza dell'Arengario has survived.

The Province of Milan (Italian: Provincia di Milano) is a province in the Lombardy region, Italy. Its capital is the city of Milan. The provincial territory is highly urbanized, resulting in the third highest population density among the Italian provinces with more than 2,000 inhabitants/km², just behind the provinces of Naples and the bordering Monza e Brianza, created in 2004 splitting the eastern part from the province of Milan itself.

This is a list of comuni (municipalities) with a population of over 30,000.

Milan (Western Lombard language: [miˈlan]; Italian: Milano [miˈlaːno] ( listen)) is the second-largest city in Italy and the capital city of the region of Lombardy and of the province of Milan. The city proper has a population of about 1.3 million, while its urban area, roughly coinciding with its administrative province and the bordering Province of Monza and Brianza (created in 2004 splitting the northern part from the province of Milan itself), is one of Europe's largest with an estimated population of over 4 million spread over 1,980 km² (764.48 sq mi), with a consequent population density of more than 2,000 inhabitants/km². The growth of many suburbs and satellite settlements around the city proper following the great economic boom of the 1950s–60s and massive commuting flows suggest that socioeconomic linkages have expanded well beyond the boundaries of the city proper and its agglomeration, creating a metropolitan area of 7.4 million population expanded all over the central section of Lombardy region. It has been suggested that the Milan metropolitan area is part of the so-called Blue Banana, the area of Europe with the highest population and industrial density.