The città metropolitana is an Italian

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

 administrative institution created by the reform of local authorities (Law 142/1990), later amended by 1993, 1995, 1997, 1999 and 2009 provisions, but not yet operative. The città metropolitana, as defined by law, includes a large core city and the smaller surrounding towns that are closely related to it with regard to economic activities and essential public services, as well as to cultural relations and to territorial features, that form its metropolitan area

Metropolitan area

The term metropolitan area refers to a region consisting of a densely populated urban core and its less-populated surrounding territories, sharing industry, infrastructure, and housing. A metropolitan area usually encompasses multiple jurisdictions and municipalities: neighborhoods, townships,...

. A città metropolitana (legal name) is therefore, by all means, a metropolitan area. The main aim of the reform was to give metropolitan areas the administrative powers of a province

Provinces of Italy

In Italy, a province is an administrative division of intermediate level between a municipality and a region .-Overview:...

. The original 1990 law individuated as metropolitan areas the communes of: Turin

Turin

Turin is a city and major business and cultural centre in northern Italy, capital of the Piedmont region, located mainly on the left bank of the Po River and surrounded by the Alpine arch. The population of the city proper is 909,193 while the population of the urban area is estimated by Eurostat...

, Milan

Milan

Milan 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 ,...

, Venice

Venice

Venice is a city in northern Italy which is renowned for the beauty of its setting, its architecture and its artworks. It is the capital of the Veneto region...

, Genoa

Genoa

Genoa |Ligurian]] Zena ; Latin and, archaically, English Genua) is a city and an important seaport in northern Italy, the capital of the Province of Genoa and of the region of Liguria....

, Bologna

Bologna

Bologna is the capital city of Emilia-Romagna, in the Po Valley of Northern Italy. The city lies between the Po River and the Apennine Mountains, more specifically, between the Reno River and the Savena River. Bologna is a lively and cosmopolitan Italian college city, with spectacular history,...

, Florence

Florence

Florence is the capital city of the Italian region of Tuscany and of the province of Florence. It is the most populous city in Tuscany, with approximately 370,000 inhabitants, expanding to over 1.5 million in the metropolitan area....

, Rome

Rome

Rome is the capital of Italy and the country's largest and most populated city and comune, with over 2.7 million residents in . The city is located in the central-western portion of the Italian Peninsula, on the Tiber River within the Lazio region of Italy.Rome's history spans two and a half...

, Bari

Bari

Bari is the capital city of the province of Bari and of the Apulia region, on the Adriatic Sea, in Italy. It is the second most important economic centre of mainland Southern Italy after Naples, and is well known as a port and university city, as well as the city of Saint Nicholas...

, Naples

Naples

Naples is a city in Southern Italy, situated on the country's west coast by the Gulf of Naples. Lying between two notable volcanic regions, Mount Vesuvius and the Phlegraean Fields, it is the capital of the region of Campania and of the province of Naples...

 and their respective hinterlands, reserving the autonomous regions

Regions of Italy

The regions of Italy are the first-level administrative divisions of the state, constituting its first NUTS administrative level. There are twenty regions, of which five are constitutionally given a broader amount of autonomy granted by special statutes....

 the right to individuate metropolitan areas in their territory. The metropolitan areas individuated by the autonomous regions were: Cagliari

Cagliari

Cagliari is the capital of the island of Sardinia, a region of Italy. Cagliari's Sardinian name Casteddu literally means castle. It has about 156,000 inhabitants, or about 480,000 including the outlying townships : Elmas, Assemini, Capoterra, Selargius, Sestu, Monserrato, Quartucciu, Quartu...

, Catania

Catania

Catania is an Italian city on the east coast of Sicily facing the Ionian Sea, between Messina and Syracuse. It is the capital of the homonymous province, and with 298,957 inhabitants it is the second-largest city in Sicily and the tenth in Italy.Catania is known to have a seismic history and...

, Messina, Palermo

Palermo

Palermo is a city in Southern Italy, the capital of both the autonomous region of Sicily and the Province of Palermo. The city is noted for its history, culture, architecture and gastronomy, playing an important role throughout much of its existence; it is over 2,700 years old...

 and Trieste

Trieste

Trieste is a city and seaport in northeastern Italy. It is situated towards the end of a narrow strip of land lying between the Adriatic Sea and Italy's border with Slovenia, which lies almost immediately south and east of the city...

. A 2009 amendment eventually added Reggio Calabria

Reggio Calabria

Reggio di Calabria , commonly known as Reggio Calabria or Reggio, is the biggest city and the most populated comune of Calabria, southern Italy, and is the capital of the Province of Reggio Calabria and seat of the Council of Calabrian government.Reggio is located on the "toe" of the Italian...

 to the list. As of 2011, none of these administrative authorities has been activated, as many of the core administrations even failed to define the legal extent of their metropolitan areas. In 2005, the Italian Ministry of the Environment

Ministry of the Environment (Italy)

The Ministry of the Environment and Protection of Land and Sea of Italy also known as MATTM, is an Italian ministry established in 1981. The ministry is responsible for environmental issues in Italy...

 has produced a study on the state of metropolitan areas regulation in Italy, that contains an analysis of the local authorities already defined and suggestions on the delimitation of the remaining.

Administrative boundaries

Rank	Core city	Area	Institutive Law	Population
1	Rome Rome Rome is the capital of Italy and the country's largest and most populated city and comune, with over 2.7 million residents in . The city is located in the central-western portion of the Italian Peninsula, on the Tiber River within the Lazio region of Italy.Rome's history spans two and a half...	Not defined		4,282,000
2	Milan Milan Milan 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 ,...	Not defined		3,707,000
3	Naples Naples Naples is a city in Southern Italy, situated on the country's west coast by the Gulf of Naples. Lying between two notable volcanic regions, Mount Vesuvius and the Phlegraean Fields, it is the capital of the region of Campania and of the province of Naples...	Not defined	|	3,059,000
4	Turin Turin Turin is a city and major business and cultural centre in northern Italy, capital of the Piedmont region, located mainly on the left bank of the Po River and surrounded by the Alpine arch. The population of the city proper is 909,193 while the population of the urban area is estimated by Eurostat...	Not defined		2,215,000
5	Bari Bari Bari is the capital city of the province of Bari and of the Apulia region, on the Adriatic Sea, in Italy. It is the second most important economic centre of mainland Southern Italy after Naples, and is well known as a port and university city, as well as the city of Saint Nicholas...	Not defined		1,541,000
6	Florence Florence Florence is the capital city of the Italian region of Tuscany and of the province of Florence. It is the most populous city in Tuscany, with approximately 370,000 inhabitants, expanding to over 1.5 million in the metropolitan area....	73 communes	DCR 130/29.03.2000	1,403,000
7	Palermo Palermo Palermo is a city in Southern Italy, the capital of both the autonomous region of Sicily and the Province of Palermo. The city is noted for its history, culture, architecture and gastronomy, playing an important role throughout much of its existence; it is over 2,700 years old...	27 communes	LR 9/1986 e Decreto Presidente Regione 10.08.1995	1,234,000
8	Catania Catania Catania is an Italian city on the east coast of Sicily facing the Ionian Sea, between Messina and Syracuse. It is the capital of the homonymous province, and with 298,957 inhabitants it is the second-largest city in Sicily and the tenth in Italy.Catania is known to have a seismic history and...	27 communes	LR 9/1986 e Decreto Presidente Regione 10.08.1995	1,054,000
9	Bologna Bologna Bologna is the capital city of Emilia-Romagna, in the Po Valley of Northern Italy. The city lies between the Po River and the Apennine Mountains, more specifically, between the Reno River and the Savena River. Bologna is a lively and cosmopolitan Italian college city, with spectacular history,...	60 communes	LR 33/12.04.1995 e LR 20/24.03.2000	915,000
10	Genoa Genoa Genoa |Ligurian]] Zena ; Latin and, archaically, English Genua) is a city and an important seaport in northern Italy, the capital of the Province of Genoa and of the region of Liguria....	41 communes	LR 12/22.07.1991 e LR 7/24.02.1997	878,000
11	Venice Venice Venice is a city in northern Italy which is renowned for the beauty of its setting, its architecture and its artworks. It is the capital of the Veneto region...	5 communes	L.R.36/12.08.1993	809,000
12	Cagliari Cagliari Cagliari is the capital of the island of Sardinia, a region of Italy. Cagliari's Sardinian name Casteddu literally means castle. It has about 156,000 inhabitants, or about 480,000 including the outlying townships : Elmas, Assemini, Capoterra, Selargius, Sestu, Monserrato, Quartucciu, Quartu...	Not defined		760,000
13	Messina	51 comnunes	LR 9/1986 e Decreto Presidente Regione 10.08.1995	662,000
14	Trieste Trieste Trieste is a city and seaport in northeastern Italy. It is situated towards the end of a narrow strip of land lying between the Adriatic Sea and Italy's border with Slovenia, which lies almost immediately south and east of the city...	Not defined		242,000
15	Reggio Calabria Reggio Calabria Reggio di Calabria , commonly known as Reggio Calabria or Reggio, is the biggest city and the most populated comune of Calabria, southern Italy, and is the capital of the Province of Reggio Calabria and seat of the Council of Calabrian government.Reggio is located on the "toe" of the Italian...	Not defined

Alternative studies

Given the situation of persisting administrative and statistical uncertainty, during the last decades a few authoritative alternative studies has been produced regarding Italian metropolitan areas. According to OECD, the largest conurbations are:

• Milan
  Milan
  Milan 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 ,...
  
   – 7.4 million
• Rome – 6.3 million
• Naples
  Naples
  Naples is a city in Southern Italy, situated on the country's west coast by the Gulf of Naples. Lying between two notable volcanic regions, Mount Vesuvius and the Phlegraean Fields, it is the capital of the region of Campania and of the province of Naples...
  
   – 3.1 million
• Turin
  Turin
  Turin is a city and major business and cultural centre in northern Italy, capital of the Piedmont region, located mainly on the left bank of the Po River and surrounded by the Alpine arch. The population of the city proper is 909,193 while the population of the urban area is estimated by Eurostat...
  
  – 2.2 million