The size of Sunbury is approximately 132 square kilometres. It has 182 parks covering nearly 3.8% of total area. The population of Sunbury in 2011 was 34,030 people. By 2016 the population was 36,073 showing a population growth of 6.0% in the area during that time. The predominant age group in Sunbury is 40-49 years. Households in Sunbury are primarily couples with children and are likely to be repaying $1400 - $1799 per month on mortgage repayments. In general, people in Sunbury work in a trades occupation. In 2011, 79.2% of the homes in Sunbury were owner-occupied compared with 76.5% in 2016. Currently the median sales price of houses in the area is $620,000.