Population
+5.1% since 2016.
Thornleigh, NSW
Thornleigh had a population of 8,898 at the 2021 Census (+5.1% since 2016). Median age 40.1. Median weekly household income $2,680. Source: ABS Census 2021, via Censible. Census 2026 data arrives June 2027.
Thornleigh at a glance
What the 2021 Census says, compared with New South Wales.
Between the 2016 and 2021 censuses, Thornleigh's population grew by 5.1% to 8,898, slower than New South Wales as a whole (+7.9%). With a median age of 40.1, it is older than the NSW average (38.4). Children under 10 make up 13.1% of residents, and people aged 70 and over 10.5%.
23.5% of households rent, a smaller share than the NSW average of 33.1%. 31.8% own their home outright. Flats and apartments are 8.0% of homes (21.8% across New South Wales). The 2021 Census counted 2,970 households.
The median household earns $2,680 a week, above the NSW average of $1,829. Renters pay a median $530 a week, and households with a mortgage repay $2,807 a month.
37.1% of residents were born overseas, more than the NSW average of 31.0%. 32.6% use a language other than English at home. 40.0% report no religion, higher than the NSW average (35.7%).
Key figures
2021 Census, Thornleigh beside NSW and Australia.
| Measure | Thornleigh | NSW | Australia |
|---|---|---|---|
| Population | 8,898 | 8,072,171 | 25,422,828 |
| Growth since 2016 | +5.1% | +7.9% | +8.6% |
| Median age | 40.1 | 38.4 | 38.2 |
| Households | 2,970 | 2,900,456 | 9,275,123 |
| Flats and apartments | 8.0% | 21.8% | 14.3% |
| Renting | 23.5% | 33.1% | 31.1% |
| Owned outright | 31.8% | 32.0% | 31.4% |
| Median household income a week | $2,680 | $1,829 | $1,747 |
| Median rent a week | $530 | $423 | $376 |
| Median mortgage repayment a month | $2,807 | $2,142 | $1,866 |
| Born overseas | 37.1% | 31.0% | 29.3% |
| Other language at home | 32.6% | 28.2% | 23.6% |
| No religion | 40.0% | 35.7% | 41.9% |
Source: ABS Census 2021, via Censible. How the figures are built
Population and age
Each census since 2011, and the age profile in 2021.
Age
Median age 40.1, against 38.4 for New South Wales.
Source: ABS Census 2021, via Censible. How the figures are built
Cultural background
The largest groups in Thornleigh at the 2021 Census.
Ancestry
Languages at home
Country of birth
Source: ABS Census 2021, via Censible. How the figures are built
Around Thornleigh
The places it belongs to, sits beside and contains.
Part of
Nearby
Explore Thornleigh in Censible
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