The Australian census is administered once every five years by the Australian Bureau of Statistics

Australian Bureau of Statistics

The Australian Bureau of Statistics is Australia's national statistical agency. It was created as the Commonwealth Bureau of Census and Statistics on 8 December 1905, when the Census and Statistics Act 1905 was given Royal assent. It had its beginnings in section 51 of the Constitution of Australia...

. The most recent census

Census

A census is the procedure of systematically acquiring and recording information about the members of a given population. It is a regularly occurring and official count of a particular population. The term is used mostly in connection with national population and housing censuses; other common...

 was conducted on 9 August 2011; the next will be conducted in 2016. Prior to the introduction of regular censuses in 1961, they had also been run in 1901, 1911, 1921, 1933, 1947, and 1954. Participating in the census is compulsory. The census counts all people who spend census night within Australia and its external and internal territories other than Norfolk Island

Norfolk Island

Norfolk Island is a small island in the Pacific Ocean located between Australia, New Zealand and New Caledonia. The island is part of the Commonwealth of Australia, but it enjoys a large degree of self-governance...

, with the exception of foreign diplomats and their families.