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A metropolitan area, sometimes referred to as a metro area or commuter belt, is a region consisting of a densely populated urban core and its less-populated surrounding territories, sharing industry, infrastructure, and housing. A metro area usually comprises multiple jurisdictions and municipalities: neighborhoods, townships, boroughs, cities, towns, exurbs, suburbs, counties, districts, states, and even nations like the eurodistricts. As social, economic and political institutions have changed, metropolitan areas have become key economic and political regions. Metropolitan areas include one or more urban areas, as well as satellite cities, towns and intervening rural areas that are socio-economically tied to the urban core, typically measured by commuting patterns. In the United States the idea of metropolitan statistical area has gained prominence.
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 is used.
- 1 General definition
- 2 Specific official definitions
- 3 See also
- 4 References
- 5 External links
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, El Monte, California is considered part of the Los Angeles metro area in the United States.
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. 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 § Lists of metropolitan areas.
Specific official definitions
The Australian Bureau of Statistics defines Greater Capital City Statistical Areas (GCCSAs) as the areas of functional extent of the seven state capitals and the Australian Capital Territory. GCCSAs replaced "Statistical Divisions" used until 2011.
In Brazil, metropolitan areas are called 'metropolitan regions'. Each State defines its own legislation for the creation, definition and organization of a metropolitan region. The creation of a metropolitan region is not intended for any statistical purpose, although the Brazilian Institute of Geography and Statistics uses them in its reports. Their main purpose is to allow for a better management of public policies of common interest to all cities involved. They don't have political, electoral or jurisdictional power whatsoever, so citizens living in a metropolitan region do not elect representatives for them.
Statistics Canada 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.
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 a significant share of the resident 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.
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 three 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 like Istanbul, a city that is dominant to others both financially and socially. There are 16 officially defined "state metropolitan areas" in Turkey, for governing purposes.
The United Kingdom government's Office for National Statistics defines "travel to work areas" 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".
Most recently on February 28, 2013, the United States Office of Management and Budget 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) and 169 Combined Statistical Areas (CSAs). The 929 Core Based Statistical Areas are divided into 388 Metropolitan Statistical Areas (MSAs – 381 for the U.S. and seven for Puerto Rico) and 541 Micropolitan Statistical Areas (μSAs – 536 for the U.S. and five for Puerto Rico). 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.
- Squires, G. Ed. Urban Sprawl: Causes, Consequences, & Policy Responses. The Urban Institute Press (2002)
- Mark, M., Katz, B., Rahman, S., and Warren, D. MetroPolicy: Shaping A New Federal Partnership for a Metropolitan Nation. Brookings Institution: Metropolitan Policy Program Report. (2008). 4–103.
- "Definition of Urban Terms" (PDF). demographia.com. Retrieved 22 October 2013.
- Prof. Dr. Iris Reuther (FG Stadt- und Regionalplanung, Universität Kassel): Presentation "Regiopole Rostock". 11 December 2008, retrieved 13 June 2009 (pdf).
- "Metropolitan and Micropolitan". Retrieved 27 April 2016.
- Whitehouse.gov Archived 2009-07-23 at the Wayback Machine.
- "Greater Capital City Statistical Areas" (PDF). Australian Bureau of Statistics. February 2013.
- "Census metropolitan area (CMA) and census agglomeration (CA)". Statistics Canada. 2007-12-11. Retrieved 2011-03-06.
- "Urbanaudit.org". urbanaudit.org. Archived from the original on 2009-02-12.
- "INSEE – Definitions and Methods – aire urbaine". INSEE France. Retrieved 2013-09-25.
- "Metropolitan Cities of India" (PDF). Central Pollution Control Board. National Informatics Centre. p. 3. Archived from the original (PDF) on 23 September 2015. Retrieved 28 July 2014.
- Geografin i statistiken – regionala indelningar i Sverige / Geography in statistics – regional divisions in Sweden (SCB, mostly in Swedish. See page 24.
- "Türk Dil Kurumu, Yabancı Sözlere Karşılıklar Kılavuzu, "metropol"". tdkterim.gov.tr. Archived from the original on 2011-07-21.
- Metropolitan municipalities in Turkey
- Beginners' guide to UK geography - Travel to Work Areas (TTWAs) Office for National Statistics
- "OMB Bulletin No. 13-01: Revised Delineations of Metropolitan Statistical Areas, Micropolitan Statistical Areas, and Combined Statistical Areas, and Guidance on Uses of the Delineations of These Areas" (PDF). United States Office of Management and Budget. February 28, 2013. Archived from the original (PDF) on March 19, 2013. Retrieved April 2, 2013.
- 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.
- 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 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.
- 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 World's Cities in 2016" (PDF). United Nations. October 2016. (page 1 illustrates metropolitan area versus city proper and urban agglomeration)
- Metropolis.org, An organisation of world metropolises
- Urban Employment Areas in Japan (Metropolitan Employment Areas in Japan)
- Turismo.fvg.it, (Metropolis read by maps in Friuli Venezia Giulia – Northeast of Italy – EU)
- Geopolis : research group, university of Paris-Diderot, France — Urbanization of the world