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38,2% af alle indbyggere i Sydney taler et andet sprog hjemme end engelsk med [[Mandarin (sprog)|mandarin]], [[arabisk (sprog)|arabisk]], [[kantonesisk]], [[vietnamesisk (sprog)|vietnamesisk]] og [[græsk]] som de mest almindelige.<ref name="Greater Sydney QuickStats" />
De fleste immigranter, som ankom til Sydney mellem 1840 og 1930, var briter, irere eller kinesere. Der har været betydelige bosættelser efter nationalitet eller religion i Sydney gennem tiderne. I starten af det 20. århundrede var irerne koncentreret i Surry Hills og skotterne i Paddington. Efter masseindvandringen efter 2. verdenskrig har nye etniske grupper etablereret sig, som f.eks. græske, libanesiske, italienske, tjekkiske, litauiske, polske, tyske, sri lankanske, filippinske, koreanske og fijianske.<ref name="Immigration">{{cite web|last=Jupp|first=James|date=2008|url=http://dictionaryofsydney.org/entry/immigration|title=Immigration|publisher=Dictionary of Sydney|accessdate=9. august 2014}}</ref> Ved folketællingen i 20112016 var 12.503071.620872 indbyggereaf indbyggerne i Greater Sydney født uden for Australien. De udgjorde 42,59% af befolkningen, ihvilket [[Cityvar ofmindre Sydney]]end ogMiami 34(58,23%) iog heleToronto Sydney.(47,0%), Detmen ermere verdensend 7.Vancouver højeste(42,5%), andelLos forAngeles en(37,7%), storby.<refNew name=ABSGCCSAXLS/><ref>{{citeYork web|publisher=.id|date=2014|url=http://profile.id.com.au/sydney/birthplace|title=Birthplace|accessdate=27.City juli(37,5%), 2014}}</ref><ref>{{citeChicago web|last=Mele(20,7%), |first=NicolaParis |date=2014(14,6%) |url=http://webdiary.com.au/cms/?q=node/2622og |title=WhenBerlin diversity(13%). meansKun cultural33.1% richnessaf |publisher=Webdiarybefolkningen |accessdate=14.havde septemberforældre, 2014som |deadurl=yesbegge |archiveurl=https://web.archive.org/20140314131123/http://webdiary.com.au/cms/?q=node/2622var |archivedate=14.født martsi 2014Australien. }}</ref>
1,5 % af befolkningen eller 70.135 indbyggere identificerede sig selv som indfødte australiere ([[aboriginere]] eller [[Torres strait øboere|torresstræde-øboere]]) i 2016.<ref name="Greater Sydney QuickStats" />
===Ancestry and immigration===
Most immigrants to Sydney between 1840 and 1930 were [[British Australian|British]], [[Irish Australian|Irish]] or [[Chinese Australian|Chinese]]. At the 2016 census, the most commonly nominated ancestries were:{{refn|group="N"|As a percentage of 4,519,022 persons who nominated their ancestry at the 2016 census.}}<ref name="quickstats.censusdata.abs.gov.au">https://quickstats.censusdata.abs.gov.au/census_services/getproduct/census/2016/communityprofile/1GSYD?opendocument</ref><ref name="censusdata.abs.gov.au">http://www.censusdata.abs.gov.au/CensusOutput/copsub2016.NSF/All%20docs%20by%20catNo/2016~Community%20Profile~1GSYD/$File/GCP_1GSYD.zip?OpenElement</ref> <!-- Only ancestries with >1% are listed. Do not use the QuickStats data from ABS for ancestries. Use the full ancestry data series (eg from ABS Community Profiles series) as the QuickStats data shows each ancestry as a percentage of all ancestry responses (where each person can list up to two, thus a far greater number than the total population) while the full data series in the ABS Community Profiles show the percentage of people nominating a given ancestry as a percentage of the population who nominated an ancestry -->
{{columns-list|colwidth=12em|
* [[English Australians|English]] (27%)
* [[Australians|Australian]] (25%){{refn|group="N"|The Australian Bureau of Statistics has stated that most who nominate "Australian" as their ancestry are part of the [[Anglo-Celtic Australian|Anglo-Celtic]] group.<ref>{{cite web|url=http://www.abs.gov.au/Ausstats/abs@.nsf/94713ad445ff1425ca25682000192af2/49f609c83cf34d69ca2569de0025c182!OpenDocument|title=Feature Article – Ethnic and Cultural Diversity in Australia (Feature Article)|first=c=AU; o=Commonwealth of Australia; ou=Australian Bureau of|last=Statistics|website=www.abs.gov.au}}</ref>}}
* [[Chinese Australians|Chinese]] (10.8%)
* [[Irish Australians|Irish]] (9.2%)
* [[Scottish Australians|Scottish]] (6.8%)
* [[Italian Australians|Italian]] (4.5%)
* [[Indian Australians|Indian]] (4.3%)
* [[Lebanese Australians|Lebanese]] (3.5%)
* [[German Australians|German]] (2.7%)
* [[Greek Australians|Greek]] (2.6%)
* [[Vietnamese Australians|Vietnamese]] (2.3%)
* [[Filipino Australians|Filipino]] (2.3%)
* [[Indigenous Australians|Indigenous]] (1.5%){{refn|group="N"|Of any ancestry. Includes those identifying as [[Aboriginal Australians]] or [[Torres Strait Islanders]]. Indigenous identification is separate to the ancestry question on the Australian Census and persons identifying as Aboriginal or Torres Strait Islander may identify any ancestry.}}
* [[Korean Australians|Korean]] (1.4%)
* [[Maltese Australians|Maltese]] (1.3%)
}}
At the 2016 census, there were 2,071,872 people living in Sydney that were born outside the country, accounting for 42.9% of the population,<ref name="ReferenceA">https://quickstats.censusdata.abs.gov.au/census_services/getproduct/census/2016/quickstat/1GSYD?opendocument</ref> below Miami (58.3%) and Toronto (47.0%), but above Vancouver (42.5%), Los Angeles (37.7%), New York City (37.5%), Chicago (20.7%), Paris (14.6%) and Berlin (13%). Only 33.1% of the population had both parents born in Australia.<ref name="ReferenceA"/> Sydney has the [[Foreign born#Metropolitan and Urban regions with largest foreign born populations|eighth-largest immigrant population]] among world metropolitan areas. Foreign countries of birth with the greatest representation are [[Mainland China]], [[England]], [[India]], [[New Zealand]], [[Vietnam]] and the [[Philippines]].<ref name="ReferenceA"/>
1.5% of the population, or 70,135 people, identified as [[Indigenous Australians]] ([[Aboriginal Australians]] and [[Torres Strait Islanders]]) in 2016.{{refn|group="N"|Of any ancestry. Includes those identifying as [[Aboriginal Australians]] or [[Torres Strait Islanders]]. Indigenous identification is separate to the ancestry question on the Australian Census and persons identifying as Aboriginal or Torres Strait Islander may identify any ancestry.}}<ref name="quickstats.censusdata.abs.gov.au"/><ref name="censusdata.abs.gov.au"/>
===Religion===
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