The City of Dublin is the area administered by Dublin City Council, but the term "Dublin" is also used to refer to the contiguous urban area which includes parts of the adjacent local authority areas of Dún Laoghaire–Rathdown, Fingal and South Dublin. Together, the four areas form the traditional County Dublin. This area is sometimes known as the Dublin Region. The population of the administrative area controlled by the City Council was 554,554 in the 2016 census, while the population of the urban area was 1,173,179. The County Dublin population was 1,273,069 and that of the Greater Dublin Area 1,904,806. The area's population is expanding rapidly, and it is estimated by the Central Statistics Office that it will reach 2.1 million by 2020.