List of metropolitan areas by population
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 Tokyo, the most populous metropolitan area in the world __NOTOC__ The question of which are the world's largest cities is a complex one, to which there is no single correct answer, simply because there are many different ways of defining a "city". One concept is the metropolitan area, which is based on the concept of a labor market area and is typically defined as an employment core (an area with a high density of available jobs) and the surrounding areas that have strong commuting ties to the core. There is currently no widely accepted, globally consistent definition of metropolitan areas, making comparisons between cities in different countries especially difficult.
One attempt at arriving a consistently defined metropolitan area concept is the study by Richard Forstall, Richard Greene, and James Pick. The basic principles of their definition involve delineating the urban area as the core, then adding surrounding communities that meet two criteria: (1) Less than 35% of the resident workforce must be engaged in agriculture or fishing; and (2) At least 20% of the working residents commute to the urban core.[ Based on their consistently defined metropolitan area criteria, they tabulate a list of the twenty largest metropolitan areas in 2003.][R.L. Forstall, R.P. Greene, and J.B. Pick, , Tijdschrift voor economische en sociale geografie 100, 277 (2009), Table 4] As population figures are interpreted and presented differently according to different methods of data collection, definitions and sources, these numbers should be viewed as approximate. Data from other sources may be equally valid but differ due to being measured according to different criteria or taken from different census years.References and notesSee alsoLists of metropolitan areas by regionLists of metropolitan areas by country or region
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