The size of Lake Cathie is approximately 18.4 square kilometres. It has 6 parks covering nearly 50.6% of total area. The population of Lake Cathie in 2016 was 3494 people. By 2021 the population was 4296 showing a population growth of 23.0% in the area during that time. The predominant age group in Lake Cathie is 70-79 years. Households in Lake Cathie are primarily childless couples and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Lake Cathie work in a professional occupation.In 2021, 78.90% of the homes in Lake Cathie were owner-occupied compared with 78.20% in 2016.
Lake Cathie has 2,660 properties. Over the last 5 years, Houses in Lake Cathie have seen a 47.95% increase in median value, while Units have seen a 71.32% increase. As at 31 October 2025:
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