The size of Mckellar is approximately 1.4 square kilometres. It has 8 parks covering nearly 7.6% of total area. The population of Mckellar in 2011 was 2,798 people. By 2016 the population was 2,747 showing a population decline of 1.8% in the area during that time. The predominant age group in Mckellar is 60-69 years. Households in Mckellar are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Mckellar work in a professional occupation. In 2011, 75.8% of the homes in Mckellar were owner-occupied compared with 77.5% in 2016. Currently the median sales price of houses in the area is $960,000.