An urban area is an area with an increased density of human-created structures in comparison to the areas surrounding it. Population density (in agriculture standing stock and Standing crop) is a measurement of Population per unit area or unit volume Urban areas may be cities, towns or conurbations, but the term is not commonly extended to rural settlements such as villages and hamlets. A city is an Urban area with a large Population and a particular Administrative, Legal, or Historical status A town is a type of settlement ranging from a few to several thousand (occasionally hundreds of thousands inhabitants although it may be applied loosely even to huge metropolitan A conurbation is an Urban area or Agglomeration comprising a number of Cities, large Towns and larger urban areas that through Population Rural areas can be large and isolated (also referred to as "the country" and/or "the countryside over the course of time A village is a clustered human settlement or community, larger than a hamlet, but smaller than a Town or City. A hamlet is (usually&mdashsee below a Rural community — that is a small settlement — which is too small to be considered a Village.
Urban areas are created and further developed by the process of urbanization. Urbanizationn (also spelled urbanisation) is the physical growth of Urban areas into rural or natural land as a result of population in-migration to an existing Measuring the extent of an urbanized area helps in analyzing population density and urban sprawl, and in determining urban and rural populations(Cubillas 2007). Population density (in agriculture standing stock and Standing crop) is a measurement of Population per unit area or unit volume Urban sprawl, also known as suburban sprawl, is the spreading of a city and its Suburbs over rural land at the fringe of an urban area
Unlike an urban area, a metropolitan area includes not only the urban area, but also satellite cities plus intervening rural land that is socio-economically connected to the urban core city, typically by employment ties through commuting, with the urban core city being the primary labor market. A metropolitan area is a large population center consisting of a large Metropolis and its adjacent zone of influence or of more than one closely adjoining neighboring central Rural areas can be large and isolated (also referred to as "the country" and/or "the countryside over the course of time Employment is a Contract between two parties, one being the employer and the other being the employee. Commuting is the process of Travelling between one's place of residence and regular place of work In fact, urbanized areas agglomerate and grow as the core population/economic activity center within a larger metropolitan area or envelope.
Metropolitan areas tend to be defined using counties or county sized political units as building blocks. Counties tend to be stable political boundaries; economists prefer to work with economic and social statistics based on metropolitan areas. Urbanized areas are a more relevant statistic for determining per capita land usage and densities (Dumlao & Felizmenio 1976).
Definitions vary somewhat amongst different nations. The minimum density requirement is generally 400 persons per square kilometer. European countries define urbanized areas on the basis of urban-type land use, not allowing any gaps of typically more than 200 meters, and use satellite photos instead of census blocks to determine the boundaries of the urban area. Land use' is also often used to refer to the distinct land use types in Zoning. Satellite imagery consists of photographs of Earth or other planets made by means of Artificial satellites. In less developed countries, in addition to land use and density requirements, a requirement that a large majority of the population, typically 75%, is not engaged in agriculture and/or fishing is sometimes used.
In Australia, urban areas are referred to as "urban centres" and are defined as population clusters of 1000 or more people, with a density of 200 or more persons per square kilometre. 
In Canada, an urban area is an area that has more than 400 people per square kilometre and has more than 1,000 people. Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page If two or more urban areas are within two kilometres of each other, they are merged into a single urban area. The boundaries of an urban area are not influenced by municipal or even provincial boundaries. 
In China, an urban area is an urban district, city and town with a population density higher than 1,500 persons per square kilometre. As for urban districts with a population density lower than 1,500 persons per square kilometre, only the population that lives in streets, town sites, and adjacent villages is counted as urban population. 
In France, an urban area is a zone (aire urbaine) encompassing an area of built-up growth (called an "urban unit" (unité urbaine) - close in definition to the North American urban area) and its commuter belt (couronne périurbaine). This article is about the country For a topic outline on this subject see List of basic France topics. The aire urbaine is an INSEE (the national statistics office of France statistical region comprising a Couronne périurbaine commuter belt around a contiguous In France an unité urbaine (literally "urban unit" is a statistical area defined by INSEE, the French national statistics office for the measurement of contiguously A couronne périurbaine, a statistical area devised by the French INSEE demographic statistics institution describes a commuter belt area around an area of dense habitation Although the official INSEE translation of aire urbaine is "urban area", most North Americans would find the same as being similar in definition to their metropolitan area. INSEE ( French: I nstitut N ational de la S tatistique et des É tudes É conomiques; inse (not) in French is the The aire urbaine is an INSEE (the national statistics office of France statistical region comprising a Couronne périurbaine commuter belt around a contiguous A metropolitan area is a large population center consisting of a large Metropolis and its adjacent zone of influence or of more than one closely adjoining neighboring central
In Japan urbanized areas are defined as contiguous areas of densely inhabited districts (DIDs) using census enumeration districts as units with a density requirement of 4,000 inhabitants per square kilometre (10,000 /sq mi). For a topic outline on this subject see List of basic Japan topics. A census is the procedure of acquiring information about every member of a given population
Statistics New Zealand defines New Zealand urban areas for statistical purposes as a settlement with a population of a thousand people or more. Statistics New Zealand (In Māori, Te Tari Tatau) is the state sector organisation of New Zealand which is responsible for the country's official Statistics New Zealand defines New Zealand urban areas for statistical purposes
In Poland, official "urban" population figures simply refer to those localities which have the status of towns (miasta). Poland (Polska officially the Republic of Poland The "rural" population is that of all areas outside the boundaries of these towns. This distinction may give a misleading impression in some cases, since some localities with only village status may have acquired larger and denser populations than many smaller towns. 
Urban areas in Sweden (tätorter) are statistically defined localities, totally independent of the administrative subdivision of the country. Urban area is a common English translation of the Swedish term tätort. There are 1,940 such localities in Sweden, with a population ranging from 200 to 1,252,000 inhabitants. 
In the United States there are two categories of urban area. The United States of America —commonly referred to as the The term urbanized area denotes an urban area of 50,000 or more people. Urban areas under 50,000 people are called urban clusters. Urbanized areas were first delineated in the United States in the 1950 census, while urban clusters were added in the 2000 census. There are 1371 United States Urban Areas & Urban Clusters with more than 10,000 people. Urban areas in the United States are defined by the US Census Bureau as contiguous Census block groups with a Population density of at least with any
The US Census Bureau defines an urban area as: "Core census block groups or blocks that have a population density of at least 1,000 people per square mile (386 per square kilometer) and surrounding census blocks that have an overall density of at least 500 people per square mile (193 per square kilometer). A census block is the smallest geographic unit used by the United States Census Bureau for tabulation of 100-percent data (data collected from all houses rather than a sample "
The concept of Urbanized Areas as defined by the US Census Bureau are often used as a more accurate gauge of the size of a city, since in different cities and states the lines between city borders and the urbanized area of that city are often not the same. For example, the city of Greenville, South Carolina has a city population under 60,000 but an urbanized area over 300,000, while Greensboro, North Carolina has a city population over 200,000 but an urbanized area population of around 270,000--meaning that Greenville is actually "larger" for some intents and purposes, but not for others, such as taxation, local elections, etc. Greenville is a mid-sized city located in the upstate of South Carolina.
About 70% of the population of the United States lives within the boundaries of urbanized area (210 out of 300 million). Combined, these area occupy about 2% of the United States. The majority of urbanized area residents are suburbanites; core central city residents make up about 30% of the urbanized area population (about 60 out of 210 million).