The size of Wantirna is approximately 8.3 square kilometres. It has 25 parks covering nearly 13.2% of total area. The population of Wantirna in 2011 was 13,766 people. By 2016 the population was 13,800 showing a population growth of 0.2% in the area during that time. The predominant age group in Wantirna is 60-69 years. Households in Wantirna are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Wantirna work in a professional occupation. In 2011, 78.8% of the homes in Wantirna were owner-occupied compared with 76.4% in 2016. Currently the median sales price of houses in the area is $1,000,000.