The size of Thornleigh is approximately 3.9 square kilometres. It has 21 parks covering nearly 19.2% of total area. The population of Thornleigh in 2011 was 8,114 people. By 2016 the population was 8,459 showing a population growth of 4.3% in the area during that time. The predominant age group in Thornleigh is 40-49 years. Households in Thornleigh are primarily couples with children and are likely to be repaying $3000 - $3999 per month on mortgage repayments. In general, people in Thornleigh work in a professional occupation. In 2011, 80% of the homes in Thornleigh were owner-occupied compared with 77.9% in 2016.
Thornleigh has 4,022 properties. Over the last 5 years, Houses in Thornleigh have seen a 38.32% increase in median value, while Units have seen a 10.76% increase. As at 30 April 2025:
25/21-27 Station St, Thornleigh is in the school catchment zone for Pennant Hills Public School and Pennant Hills High School.
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Population 8,459
0-9
15%
10-19
14%
20-29
10%
30-39
13%
40-49
17%
50-59
13%
60-69
9%
70-79
6%
80-89
3%
90-99
1%