Sydney is Australia's most populous city, and is also the most populous city in Oceania. In the 2011 census 4,627,345 persons declared themselves as residents of the Sydney Statistical Division - about one-fifth (19.38%) of Australia's total population. If contiguous urban areas are considered, Sydney's population was 3,641,421 persons. Sydney is also the most densely populated city in Australia.
The median age of Sydney residents was 35 years, and households comprised an average of 2.7 members.
The officially estimated population for the Sydney Statistical Division at 30 June 2010 was 4,575,532.
population by year
European settlement in Sydney began in 1788, and in 1800 Sydney had around 3,000 inhabitants. It took time for its population to grow - in 1851 its population was only 39,000, compared with 77,000 in Melbourne. The subsequent gold rushes in Victoria caused the population of Melbourne to increase rapidly, while the lesser gold rushes in New South Wales had a less profound effect on the population of Sydney.
Sydney overtook Melbourne as Australia's most populous city in the early twentieth century, and reached the million inhabitants milestone around 1925. The opening of the Sydney Harbour Bridge helped pave the way for further urban development north of Sydney Harbour. Post-war immigration and a baby boom helped the population reach two million by 1962. Sydney remained Australia's most populous city throughout the 20th Century, and is projected to retain this position for much of the 21st Century.
Ethnic groups 
|Significant overseas born populations|
|Country of Birth||Population (2006)|
|People's Republic of China||109,142|
The principal ancestries of Greater Sydney's residents (as surveyed in 2011) are:
- 20.4% Australian
- 20.4% English
- 6.6% Irish
- 6.5% Chinese
- 5.0% Scottish
The principal countries of birth of Greater Sydney's residents (as surveyed in 2011) are:
- Australia (59.9%)
- England (3.5%)
- China (excludes SARs and Taiwan) (3.4%)
- India (2.0%)
- New Zealand (1.9%)
- Vietnam (1.6%)
Aborigines were about 2% of all Sydney residents.
At the 2006 census respondents could nominate up to two ancestries they identified themselves as belonging to.
The most common languages spoken at home are English (the sole language of 60.8%) of the population, Arabic (spoken by 4.4%), Cantonese (3.4%), Mandarin (2.6%), Greek (2.2%) and Vietnamese (2.0%).
|Most common ancestries of
Sydney urban area (2006)
Some suburbs are associated with particular ethnic groups. The adjacent image shows concentrations of persons born in different regions of the world residing in particular parts of Sydney.
At the 2006 Census, the most common responses for religion were Catholic (29.2%), Anglican (16.5%), Eastern Orthodox (4.8%) and Islam (4.4%). 14.1% declared no religious affiliation. 10.4% left the question blank, 3.7% were Buddhists, 1.7% were Hindu, 0.9% were Jewish
See also 
- "3218.0 – Regional Population Growth, Australia, 2009–10". Australian Bureau of Statistics. 31 March 2011. Retrieved 31 March 2011.
- "3105.0.65.001 - Australian Historical Population Statistics, 2006". Australian Bureau of Statistics. 23 May 2006. Retrieved 21 November 2011.Table 1. Population by sex, states and territories, 31 December, 1788 onwards
- "Australian Historical Population Statistics, 2008". Australian Bureau of Statistics. 5 August 2008. Retrieved 21 November 2011.
- "3218.0 – Regional Population Growth, Australia, 2009–10". Australian Bureau of Statistics. 31 March 2011. Retrieved 21 November 2011.
- "3222.0 – Population Projections, Australia, 2006 to 2101". Australian Bureau of Statistics. 4 September 2008. Retrieved 21 November 2011.
- Australian Bureau of Statistics (25 October 2007). "Community Profile Series : Sydney (Statistical Division)". 2006 Census of Population and Housing. Retrieved 2008-02-28.
- Australian Bureau of Statistics (25 October 2007). "Sydney (Urban Centre/Locality)". 2006 Census QuickStats. Retrieved 23 November 2011. Map
- "Cat. No. 2068.0 - 2006 Census Tables". Australian Bureau of Statistics. 2007. Retrieved 18 November 2011.
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