The size of Trevallyn is approximately 9.9 square kilometres. It has 9 parks covering nearly 59.2% of total area. The population of Trevallyn in 2016 was 4562 people. By 2021 the population was 4826 showing a population growth of 5.8% in the area during that time. The predominant age group in Trevallyn is 40-49 years. Households in Trevallyn are primarily couples with children and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Trevallyn work in a professional occupation.In 2021, 72.20% of the homes in Trevallyn were owner-occupied compared with 72.80% in 2016..
Trevallyn has 2,312 properties. Over the last 5 years, Houses in Trevallyn have seen a 49.98% increase in median value, while Units have seen a 80.87% increase. As at 30 June 2025:
6/1-3 Valley St, Trevallyn is in the school catchment zone for Riverside Primary School.
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Population 4,826
0-9
11%
10-19
14%
20-29
11%
30-39
13%
40-49
15%
50-59
13%
60-69
12%
70-79
8%
80-89
3%
90-99
1%