The size of Balwyn is approximately 4.4 square kilometres. It has 13 parks covering nearly 4.1% of total area. The population of Balwyn in 2011 was 12,943 people. By 2016 the population was 13,321 showing a population growth of 2.9% in the area during that time. The predominant age group in Balwyn is 10-19 years. Households in Balwyn are primarily couples with children and are likely to be repaying over $4000 per month on mortgage repayments. In general, people in Balwyn work in a professional occupation. In 2011, 72.9% of the homes in Balwyn were owner-occupied compared with 71.2% in 2016. Currently the median sales price of houses in the area is $2,785,500.