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National census of Australia, held every five years
the process and history of counting Australia's population

The Census in Australia, officially the Census of Population and Housing, is the national census in Australia that occurs every five years. The census collects key demographic, social and economic data from all people in Australia on census night, including overseas visitors and residents of Australian external territories, only excluding foreign diplomats. The census is the largest and most significant statistical event in Australia and is run by the Australian Bureau of Statistics (ABS). Every person must complete the census, although some personal questions are not compulsory. The penalty for failing to complete the census after being directed to by the Australian Statistician is one federal penalty unit, or The Australian Bureau of Statistics Act 1975 and Census and Statistics Act 1905 authorise the ABS to collect, store, and share anonymised data. The most recent census was held on 10 August 2021, with the data planned to be released starting from mid 2022. The next census will be held in early August 2026. The first Australian census was held on 2 April 1911.

The census, like all ABS data, is collected and published in geographical divisions as defined by the Australian Statistical Geography Standard (ASGS). The ASGS was released in 2011, replacing the former Australian Standard Geographical Classification. The Standard is reviewed and updated every five years to align with the census. The ABS also releases data divided into areas not managed by the Bureau, such as postcodes (managed by Australia Post) and Local Government Areas (managed by state and territory governments).

The Census and Statistics Act 1905 and Privacy Act 1988 prohibit the ABS from releasing any personally identifiable census data to any government, private or individual entity. In 1979, the Australian Law Reform Commission released Privacy and the Census, a report detailing legislative privacy measures related to the census. One of the key elements under question was the inclusion of names and addresses in census data. It was found that excluding names reduced the accuracy of the data; individuals were more likely to leave questions blank. Not collecting this data would also impair the ability of the ABS to ensure that all participants have responded. The ABS protects personal information primarily through anonymisation of data. Personal information is stored separately from other census data, and separately from each other. Names are mutated into anonymised codes, which are then used to link data. When the Federation of Australia occurred in 1901, the new Constitution contained a provision (section 127), which said: "In reckoning the numbers of the people of the Commonwealth, or of a State or other part of the Commonwealth, Aboriginal [persons ] shall not be counted." In 1967, a referendum was held which approved two amendments to the Australian constitution relating to Indigenous Australians. The second of the two amendments deleted section 127 from the Constitution. It was widely believed at the time of the referendum, and is still often said, that section 127 meant that Aboriginal persons were not counted in Commonwealth censuses before 1967. In fact section 127 related to calculating the population of the states and territories for the purpose of allocating seats in Parliament and per capita Commonwealth grants. Its purpose was to prevent Queensland and Western Australia using their large Aboriginal populations to gain extra seats or extra funds. When the person does not identify, or the community does not accept the person, as such, it is also a violation of article 20 of the Universal Declaration of Human Rights. At the first Australian census in 1911 only those Aboriginal persons living near white settlements were enumerated, and the main population tables included only those of 50 percent or more non Aboriginal descent. Details of Aboriginal persons of 50 percent or more non Aboriginal descent were included in separate tables to Aboriginal persons of more than 50 percent Aboriginal descent. This practice was followed in all subsequent censuses up to 1966. Since 1967, the ABS has considered Torres Strait Islanders a separate Indigenous people. Prior to 1947, Torres Strait Islanders were regarded as Aboriginal and excluded when not of 50 percent or more non Aboriginal descent.

Australia's first census was held in November 1828 in New South Wales, a British colony at the time. Previous government statistical reports had been taken from "musters" where white immigrants were brought together for counting. In 1828, the white population was 36,598: 20,870 settlers and 15,728 convicts. 23.8% of the population were born in the colony and 24.5% were women. There were 25,248 Protestants and 11,236 Catholics. Indigenous Australians were not counted. Of the 36,598 people, 638 were living in what is now Queensland. There were also 18,128 people in Tasmania.

In 1911 the census asked about deaf mutism. This question was also asked in the next two censuses of 1921 and 1933. Deaf mutism was found to be very high among 10 to 14 year olds, with the same pattern existing in the 1921 census among 20 to 24 year olds. The statisticians report on the 1921 census noted that it was "a reasonable assumption therefore that the abnormal number of deaf mutes . was the result of the extensive epidemic of infectious diseases which occurred soon after many in those age groups were born". Rubella was not known to be a possible contributor. During World War II, the ophthalmologist Norman McAllister Gregg began to investigate the connection between birth defects and the infection of mothers early in their pregnancy. In 1951, prompted by Gregg's work, Australian statistician Oliver Lancaster examined the census figures of 1911, 1921 and 1933. He found a peak in the level of deaf mutism in the age cohort born in 1898 and 1899 and that this matched with a known outbreak of rubella in those years. "This was the first time in the world that the link between rubella and congenital problems with unborn children was firmly established." The 1921 census introduced automatic machine tabulation equipment, hired from England for the census. The census was subsequently conducted in 1933, 1947, 1954, and every five years from 1961 onwards.

Following the 1967 referendum removing section 127 from the Constitution, the "race" question was re designed for the 1971 census and methods for remote area collection examined to improve identification of Indigenous Australian groups.

The 1986 Census was held on 30 June 1986. Scanned data of the 1986 Census is available on the ABS website.

The 1991 census was held on 6 August 1991.

The 1996 census was held on 6 August. There were 16,892,423 people counted in Australia. Of these, 342,864 people identified themselves as Indigenous Australians. There were 139,594 overseas visitors.

The 2001 census was held on 7 August. There were 18,769,420 people counted in Australia. Of these, 410,003 people identified as Indigenous Australians. There were 203,101 overseas visitors. Across Australia, 8.4% of estimated dwellings lodged online. The highest percentage of internet lodgements was in the Australian Capital Territory with 14.8% of households using This was a markedly different proportion of households than elsewhere in Australia, with the other states and territory ranging from 5.9% in the Northern Territory to 8.9% in Western Australia. The 2011 census was the largest logistical peacetime operation ever undertaken in Australia, employing over 43,000 field staff to ensure approximately 14.2 million forms were delivered to 9.8 million households. The first results of the census were released in June 2012 on the Australian Bureau of Statistics website. The cost of the 2011 census was 440 million.

The census occurred on 9 August 2016. For the first time, the ABS the census was by default filled out online, claiming it expected more than 65% of Australians would be completing the census online. Reflecting this new preference, the tagline of the ad campaign for the census was the rhyming slogan "Get online on August 9". Across many regions, paper forms were no longer delivered by default to homes, and households that wished to complete a paper census had to order such forms via an automated hotline. Letters were sent to each dwelling with unique code numbers that people would need to either login to the census website or order a paper form if they preferred. By census night, many households had still not received such a letter. Contrary to previous years where censuses were both delivered and retrieved from households by dedicated census employees, in 2016 most of the paperwork relating to the census was delivered from and to the ABS by Australia Post. The 2016 census was met by two controversies. The first was that the retention of names and addresses increased to up to 4 years, from 18 months in the 2006 and 2011 censuses, leading to concerns about privacy and data security. As such, some Australian Senate crossbenchers (from the Greens, Nick Xenophon Team and Jacqui Lambie Network) said they would not complete those specific sections of the census, despite the fines associated with incorrect completion of the census. The second was that many Australians could not complete the census online on the designated day. While a paper census form was also available on request, for 2016 the ABS was aiming for two thirds online. However, the online census website shut down at about 7:30 pm AEST on the night it was to be completed. According to the ABS, throughout 9 August the census website received four denial of service attacks. At 7:30 pm, when the site was being heavily used, a software failure meant that the ABS was unable to keep blocking the denial of service attacks, leading to the failure of a router. As a result, the ABS decided to close down the system as a precaution. The ABS reported that no census data were compromised. The Australian Signals Directorate was assisting the ABS to bring the infrastructure back online more than 24 hours after the closure. The census website was restored at 2:30 pm on 11 August. On the same day, Prime Minister Malcolm Turnbull stated his displeasure over the event, which had "been a failure of the ABS", with his expectation that "heads will roll" once a review was complete. Leader of the opposition Bill Shorten said that the 2016 census had been the "worst run in the history of Australia". The ABS blamed service provider IBM for the failure in the online census, saying that IBM had advised on the preparedness and resilience to DDoS attacks and had not offered any further protections that could be employed. On 31 August, the Parliament of Australia initiated an inquiry into the 2016 census. It released its findings on 24 November: no individual party was found to be responsible but it was shared between the government, IBM, and other sub contractors. The census forms were able to be submitted online until 23 September. Once collection was complete, the ABS issued an announcement which confirmed that in spite of the initial online problems, there was a preliminary response rate of more than 96%. This consisted of 4.9 million (over 58%) online submissions and 3.5 million paper forms. The preliminary response rate was similar to the previous two census response rates of 95.8% in 2006 and 96.5% in 2011. According to the ABS, the preliminary release of census data became available to the public on the ABS website on 11 April 2017, two months earlier than for any previous census. The main release of data occurred on 27 June 2017 and a final data release on 17 October 2017.

The 2021 Census occurred on 10 August 2021, and was run by the Australian Bureau of Statistics (ABS). It was Australia's 18th Census. The 2021 Census achieved a response rate above the Australian Bureau of Statistics target obtaining data from 10 million (10,852,208) dwellings. The dwelling response rate was 96.1 per cent, up from 95.1 per cent in 2016. The Statistical Independent Assurance Panel, established by the Australian Statistician to provide assurance of Census data quality, concluded that the 2021 Census data is fit for purpose, is of comparable quality to the 2011 and 2016 Censuses and can be used with confidence. The first release of the Census data was published on 28 June 2022. Census data can be accessed using a number of Census data tools.