A metropolitan area or metro is a region consisting of a densely populated urban core
and its less-populated surrounding territories under the same administrative division
, sharing industry, infrastructure and housing. A metro area usually comprises multiple jurisdictions
s, and even nation
s like the eurodistrict
s. As social, economic and political institutions have changed, metropolitan areas have become key economic and political regions.
Metropolitan areas include satellite cities
, towns and intervening rural areas that are socioeconomically tied to the urban core, typically measured by commuting
patterns. Most metropolitan areas are anchored by one core city
such as Paris metropolitan area
), Mumbai Metropolitan Region
and New York metropolitan area
(New York City
). In some cases metropolitan areas have multiple centers of close to equal importance, such as Dallas–Fort Worth metropolitan area
and Fort Worth
), Islamabad–Rawalpindi metropolitan area
), the Rhine-Ruhr
in Germany and the Randstad
in the Netherlands.
In the United States
, the concept of the metropolitan statistical area
has gained prominence. Metropolitan areas may themselves be part of larger megalopolis
es. For urban centres outside metropolitan areas, that generate a similar attraction at smaller scale for their region, the concept of the regiopolis
and respectively regiopolitan area or regio was introduced by German professors in 2006. In the United States, the term micropolitan statistical area
A metropolitan area combines an urban agglomeration
(the contiguous, built-up area) with zones not necessarily urban in character, but closely bound to the center by employment or other commerce. These outlying zones are sometimes known as a commuter belt, and may extend well beyond the urban zone, to other political entities. For example, Islip, New York
on Long Island
is considered part of the New York metropolitan area
In practice, the parameters of metropolitan areas, in both official and unofficial usage, are not consistent. Sometimes they are little different from an urban area, and in other cases they cover broad regions that have little relation to a single urban settlement; comparative statistics for metropolitan area should take this into account. The term "Metropolitan" can also refer to a county
-level municipal government
structure, with some shared services between a central city and its suburbs, which may or may not include the entirety of a metropolitan area. Population figures given for one metro area can vary by millions.
There has been no significant change in the basic concept of metropolitan areas since its adoption in 1950, although significant changes in geographic distributions have occurred since then, and more are expected. Because of the fluidity of the term "metropolitan statistical area," the term used colloquially is more often "metro service area," "metro area," or "MSA" taken to include not only a city, but also surrounding suburban, exurban and sometimes rural areas, all which it is presumed to influence. A polycentric metropolitan area contains multiple urban agglomerations not connected by continuous development. In defining a metropolitan area, it is sufficient that a city or cities form a nucleus with which other areas have a high degree of integration.
See also the many lists of metropolitan areas itemized at .
The Australian Bureau of Statistics
defines Greater Capital City Statistical Areas (GCCSAs) as the areas of functional extent of the eight state and territory capitals. GCCSAs replaced "Statistical Divisions" used until 2011.
, "Metropolitan Regions", "Integrated Development Areas", and "Urban Agglomerations" are created by statute
. Each state
defines its own legislation for the creation, definition and organization of a metropolitan region. The creation of a metropolitan region is not for any statistical purpose, although the Brazilian Institute of Geography and Statistics (IBGE)
uses them in reports. Their main purpose is to improve management of public policies of common interest to all municipalities included within. They do not have any political, electoral or jurisdictional power whatsoever, so citizens do not elect representatives for them.
The IBGE defines also "Immediate Geographic Areas" (formerly termed microregions
) which capture the region "surrounding urban centers for the supply of immediate needs of the population". Intended for policy planning purposes, as of March 2021 census data is not tabulated on the level of these Areas, but instead at the municipality
or state level.
defines a census metropolitan area
(CMA) as an area consisting of one or more adjacent municipalities situated around a major urban core. To form a CMA, the metropolitan area must have a population of at least 100,000, at least half within the urban core. To be included in the CMA, adjacent municipalities must have a high degree of integration with the core, as measured by commuter flows derived from census data.
In Chinese, there used to be no clear distinction between "megalopolis
" (, lit. city cluster) and "metropolitan area" () until National Development and Reform Commission
issued ''Guidelines on the Cultivation and Development of Modern Metropolitan Areas'' () on Feb 19, 2019, in which a metropolitan area was defined as "an urbanized spatial form in a megalopolis dominated by (a) supercity(-ies) or megacity(-ies), or a large metropolis playing a leading part, and within the basic range of 1-hour commute area."
The European Union
's statistical agency, Eurostat
, has created a concept named "larger urban zone
" (LUZ). The LUZ represents an attempt at a harmonised definition of the metropolitan area, and the goal was to have an area from which a significant share of the residents commute into the city, a concept known as the "functional urban region".
France's national statistics institute, the INSEE, names an urban core and its surrounding area of commuter influence an ''aire urbaine
'' (official translation: "urban area"). This statistical method applies to agglomerations of all sizes, but the INSEE sometimes uses the term ''aire métropolitaine'' (metropolitan area) to refer to France's largest ''aires urbaines''.
In German definition, metropolitan areas are eleven most densely populated areas in the Federal Republic of Germany
. They comprise the major German cities and their surrounding catchment areas and form the political, commercial and cultural centres of the country.
For urban centres outside metropolitan areas, that generate a similar attraction at smaller scale for their region, the concept of the Regiopolis and respectively regiopolitan area or regio was introduced by German professors in 2006.
, a metropolitan city is defined as one with a population more than 1 million.
In 2001, Italy transformed 14 provinces of some of the country's largest cities into ''Metropolitan Cities
''. Therefore the territory of the ''Metropolitan City'' corresponds to that of a normal Italian province.
In Japan, a metropolitan area () is a division set separately from administrative areas
in order to define wide urban areas used in the Census conducted by the Statistics Bureau of the Ministry of Internal Affairs and Communications
The Greater Tokyo Area
is the most populous metropolitan area in the world.
* Central City ()
**Those of the greater metropolitan areas are the 23 special wards in the metropolis of Tokyo
and other designated cities
**Those of the metropolitan areas are cities with a population of more than half of a million, which are not included in the greater metropolitan areas.
If the central cities are next to each other, the areas are integrated into one large area.
* Surrounding Municipality (, lit. 'surrounding cities, towns and villages')
**Those are municipalities with ratios of the number of people commuting to the central city over 15 years old being 1.5% or more of the permanent population of and close to the central cities.
If a municipality is surrounded by the surrounding municipalities, it will be a surrounding municipality.
Metropolitan areas are known as ''zonas metropolitanas'' in Mexico. The National Population Council (CONAPO) defines them as:
* a set of two or more municipalities where a city with a population of at least 100,000 is located, and whose urban area, functions and activities exceed the limits of the municipality.
* municipalities with a city of more than 500,000 inhabitants, or a city of more than 200,000 inhabitants located in the northern and southern border areas and in the coastal zone.
* municipalities where state capitals are located, if they are not already included in a metropolitan zone.
As of 2018, there are 74 ''zonas metropolitanas'' in Mexico. 75.1 million people, 62.8% of the country population, live within a metropolitan area.
has 9 Metropolitan areas with population more than a million. Here is List of metropolitan areas in Pakistan
currently has three metropolitan areas defined by the National Economic and Development Authority
(NEDA). These metropolitan areas are separated into three main geographical areas; Metro Manila
(which is located in Luzon
), Metro Cebu
(which is located in Visayas
), and Metro Davao
(which is located in Mindanao
). The official definition of each area does not necessarily follow the actual extent of continuous urbanization. For example, the built-up area of Metro Manila
has long spilled out of its officially defined borders into the adjacent provinces of Bulacan
, and Cavite
. The number of metropolitan areas in the Philippines was reduced from 13 in 2007 to the current three based from the 2017–2022 Philippine Development Plan by NEDA. The other 10 metropolitan areas were Metro Angeles
, Metro Bacolod
, Metro Baguio
, Metro Batangas
, Metro Cagayan de Oro
, Metro Dagupan
, Metro Iloilo–Guimaras
, Metro Butuan
, Metro Naga
, and Metro Olongapo
The Greater Johannesburg metropolitan area
is the largest metropolitan area in South Africa
. Its population was over 9.6 million as of the 2011 South Africa Census, in contrast to its urban area, which consisted of approximately 7.9 million inhabitants as of 2011. Conversely, metropolitan municipalities
in South Africa are defined as commonly governed areas of a metropolitan area. The largest such metropolitan municipal government entity in South Africa is the City of Johannesburg Metropolitan Municipality
, which presided over nearly 5 million people as of 2016. However, the Greater Johannesburg metropolitan area houses roughly ten times the population of its core municipal city of Johannesburg
, which contained 957,441 people as of the 2011 census.
Sweden defines a metropolitan area as a group of municipalities, based on statistics of commuting between central municipalities and surrounding municipalities and taking into account existing planning cooperation in the country's three geographic regions. They were defined around 1965. In 2005, a number of further municipalities were added to the defined areas.
The word metropolitan describes a major city in Turkey
, a city that is dominant to others both financially and socially. There are 30 officially defined "state metropolitan areas" in Turkey, for governing purposes.
The United Kingdom
government's Office for National Statistics
defines "travel to work area
s" as areas where "at least 75% of an area's resident workforce work in the area and at least 75% of the people who work in the area also live in the area".Beginners' guide to UK geography - Travel to Work Areas (TTWAs)
Office for National Statistics
As of February 28, 2013, the United States Office of Management and Budget (OMB) defined 1,098 statistical areas for the metropolitan areas of the United States and Puerto Rico.
These 1,098 statistical areas comprise 929 Core-Based Statistical Areas (CBSAs) [The United States Office of Management and Budget (OMB) defines a Core-Based Statistical Area (CBSA) as one or more adjacent counties or county equivalents that have at least one urban core area of at least 10,000 population, plus adjacent territory that has a high degree of social and economic integration with the core as measured by commuting ties.] and 169 Combined Statistical Areas (CSAs). [The United States Office of Management and Budget (OMB) defines a Combined Statistical Area (CSA) as an aggregate of adjacent Core Based Statistical Areas that are linked by commuting ties.] The 929 Core-Based Statistical Areas are divided into 388 Metropolitan Statistical Areas (MSAs – 381 for the U.S. and seven for Puerto Rico) [The United States Office of Management and Budget (OMB) defines a Metropolitan Statistical Area (μSA) as a Core Based Statistical Area having at least one urban cluster of at least 50,000 population, plus adjacent territory that has a high degree of social and economic integration with the core as measured by commuting ties.] and 541 Micropolitan Statistical Areas (μSAs – 536 for the U.S. and five for Puerto Rico). [The United States Office of Management and Budget (OMB) defines a Micropolitan Statistical Area (μSA) as a Core Based Statistical Area having at least one urban cluster of at least 10,000 but less than 50,000 population, plus adjacent territory that has a high degree of social and economic integration with the core as measured by commuting ties.] The 169 Combined Statistical Areas (166 for the U.S. and three for Puerto Rico) each comprise two or more adjacent Core Based Statistical Areas.
The Office of Management and Budget defines a Metropolitan Statistical Area as one or more adjacent counties or county equivalents that have at least one urban area of at least 50,000 population, plus adjacent territory that has a high degree of economic and social integration with the core as measured by commuting ties. The OMB then defines a Combined Statistical Area as consisting of various combinations of adjacent metropolitan and micropolitan statistical areas with economic ties measured by commuting patterns. The Office of Management and Budget further defines a core-based statistical area (CBSA) to be a geographical area that consists of one or more counties (or equivalents) anchored by an urban center of at least 10,000 people plus adjacent counties that are socioeconomically tied to the urban center by commuting.
* Developed environments
* Economic restructuring
* Metropolitan statistical area
* Metropolitan economy
* Urban sprawl
* Urban heat island
Lists of metropolitan areas
* List of metropolitan areas that overlap multiple countries
* List of metropolitan areas by population
* List of metropolitan areas in Asia
* List of metropolitan areas in Africa
* List of metropolitan areas in the Americas
** List of North American metropolitan areas by population
** List of Metropolitan Statistical Areas
* List of metropolitan areas in Europe
** List of metropolitan areas (LUZ) in the European Union
Metropolitan planning theories
* New Urbanism
* Smart growth
* Transit-oriented development
* Amalgamation (politics)
* Census metropolitan area
* Combined statistical area
* Consolidated city-county
* Industrial region
* Larger Urban Zones (LUZ)
* Megalopolis (city type)
* Urban sprawl
* Urban area
* World's largest cities
* (page 1 illustrates metropolitan area versus city proper and urban agglomeration)
An organisation of world metropolises
(Metropolitan Employment Areas in Japan)
(Metropolis read by maps in Friuli Venezia Giulia – Northeast of Italy – EU)
: research group, university of Paris-Diderot, France — Urbanization of the world