The Brighton and Hove Built-up area or Brighton/Worthing/Littlehampton conurbation has a population of 474,485 (2011 census), making it England's 12th largest conurbation. This was an increase of around 3% from the 2001 population of 461,181. Named the Brighton/Worthing/Littlehampton conurbation by the Office for National Statistics for the 2001 census and Brighton and Hove Built-up area for the 2011 census, the area has also been known as "Greater Brighton". The conurbation dominates West and East Sussex, with around 1 in 3 of Sussex's population living within its boundaries. It is also the second largest conurbation in the South East region of England and the second largest conurbation on the English Channel coast, in either England or France. In both of these cases the Brighton conurbation trails the Southampton and Portsmouth conurbation.