This is a list of city regions in the United Kingdom by population, area and population density. They consist of Combined authorities and combined county authorities in England, and regional city deals in Scotland and in Wales. Data is gathered by the Office for National Statistics (ONS).
Despite the terminology, which is also used by the ONS, the city regions are established on the basis of local devolution deals, which results in also less populated areas being included within this list, whilst some other major cities in the UK might be excluded. The list also does not delineate metropolitan or urban areas, which are separate concepts.