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A suburb, more broadly suburban area, is an area within a metropolitan area that is primarily a residential area, though may also include commercial and mixed-use areas. A suburb can exist either as part of a larger city/urban area or as a separate political entity. The name describes an area which is not as densely populated as an inner city, yet more densely populated than a rural area in the countryside. In many metropolitan areas, suburbs exist as separate residential communities within commuting distance of a city (cf "bedroom suburb".) Suburbs can have their own political or legal jurisdiction, especially in the United States, but this is not always the case, especially in the United Kingdom, where most suburbs are located within the administrative boundaries of cities. In most English-speaking countries, suburban areas are defined in contrast to central or inner city areas, but in Australian English and South African English, suburb has become largely synonymous with what is called a "neighborhood" in the US, and the term encompasses inner city areas.In some areas, such as India, China, New Zealand, Canada, the United Kingdom, and parts of the United States, new suburbs are routinely annexed by adjacent cities due to urban sprawl. In others, such as Morocco, France, and much of the United States, many suburbs remain separate municipalities or are governed locally as part of a larger metropolitan area such as a county, district or borough. In the United States, regions beyond the suburbs are known as "exurban areas" or exurbs; exurbs have less population density than suburbs, but still more than rural areas. Suburbs and exurbs are linked to the nearby larger metropolitan area economically, particularly by commuters.
Suburbs first emerged on a large scale in the 19th and 20th centuries as a result of improved rail and road transport, which led to an increase in commuting. In general, they are less densely populated than inner city neighborhoods within the same metropolitan area, and most residents routinely commute to city centers or business districts via private vehicles or public transits; however, there are many exceptions, including industrial suburbs, planned communities, and satellite cities. Suburbs tend to proliferate around cities that have an abundance of adjacent flat land.In North America
In the United States and Canada, suburb can refer either to an outlying residential area of a city or town or to a separate municipality or unincorporated area outside a town or city.Although a majority of Americans regard themselves as residents of suburban communities, the federal government of the United States has no formal definition for what constitutes a suburb in the United States, leaving its precise meaning disputed.In Canada, the term may also be used in the British sense, especially as cities annex formerly outlying areas.North America
Boston and New York City spawned the first major suburbs. The streetcar lines in Boston and the rail lines in Manhattan made daily commutes possible. No metropolitan area in the world was as well served by railroad commuter lines at the turn of the twentieth century as New York, and it was the rail lines to Westchester from the Grand Central Terminal commuter hub that enabled its development. Westchester's true importance in the history of American suburbanization derives from the upper-middle class development of villages including Scarsdale, New Rochelle and Rye serving thousands of businessmen and executives from Manhattan.
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