The Leicester Urban Area or Leicester Built Up Area (2011 onwards) is an urban agglomeration defined by the Office of National Statistics (ONS), centred on the City of Leicester in the English Midlands. With a population of 508,916 at the time of the 2011 census, the Built Up Area is the eleventh largest in England and thirteenth largest in the United Kingdom. It comprises Leicester itself and its suburbs, all of which are contiguous with, or situated in close proximity to, the city.