The size of Mermaid Waters is approximately 7.1 square kilometres.

It has 68 parks covering nearly 8.9% of total area.

The population of Mermaid Waters in 2011 was 11,789 people. By 2016 the population was 12,042 showing a population growth of 2.1% in the area during that time.

The predominant age group in Mermaid Waters is 40-49 years.

Households in Mermaid Waters are primarily couples with children and are likely to be repaying $1800 – $2399 per month on mortgage repayments.

In general, people in Mermaid Waters work in a professional occupation.

In 2011, 64.9% of the homes in Mermaid Waters were owner-occupied compared with 66.1% in 2016.