Analysis of the ancestry responses of the population in SSROC region in 2021 shows that the top five ancestries nominated were:
- English (385,308 people or 22.0%)
- Australian (340,153 people or 19.4%)
- Chinese (225,477 people or 12.9%)
- Irish (151,323 people or 8.6%)
- Scottish (102,819 people or 5.9%)
In combination these five ancestries account for 1,205,080 responses in total, or 68.69% of all responses.
The major differences between the ancestries of the population in SSROC region and Sutherland Shire were:
- A larger percentage of people with Chinese ancestry (12.9% compared to 3.9%)
- A smaller percentage of people with Australian ancestry (19.4% compared to 35.6%)
- A smaller percentage of people with English ancestry (22.0% compared to 38.0%)
- A smaller percentage of people with Irish ancestry (8.6% compared to 12.4%)