The Sheffield Urban Area is a conurbation with a population of 640,720 (2001 census) making it the 8th largest conurbation in the United Kingdom and England's 6th largest. Named the Sheffield Urban Area by the Office for National Statistics, it must not be confused with the Sheffield City Region, a non-government term, although often used, particularly by the business community. The conurbation dominates South Yorkshire, with over half of the county's population living in this urban area.
The urban area is relatively densly-populated, with 3,949.2 people per km².
The city of Sheffield contributes just over two thirds of the population of the whole conurbation.
The conurbation's population is made up of the following settlements as defined by the Office for National Statistics (2001 population in brackets):