Urban Landscape

The United Kingdom's Office for National Statistics has produced census results from urban areas since 1951, since 1981 based upon the extent of irreversible urban development indicated on Ordnance Survey maps. The definition is an extent of at least 20 ha and at least 1,500 census residents. Separate areas are linked if less than 200 m (220 yd) apart. Included are transportation features. The 20 largest urban areas are Greater London Urban Area, West Midlands Urban Area, Greater Manchester Urban Area, West Yorkshire Urban Area, Greater Glasgow, Tyneside, Liverpool Urban Area, Nottingham Urban Area, Sheffield Urban Area, Bristol Urban Area, Greater Belfast, Brighton/Worthing/Littlehampton, Edinburgh, Portsmouth Urban Area, Leicester Urban Area, Bournemouth Urban Area, Reading/Wokingham Urban Area, Teesside, The Potteries Urban Area and Coventry/Bedworth Urban Area
United States
In the United States there are two categories of urban area. 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 1,371 urban areas and urban clusters with more than 10,000 people.