The size of Donnybrook is approximately 15.7 square kilometres. It has 3 parks covering nearly 3.2% of total area. The population of Donnybrook in 2011 was 461 people. By 2016 the population was 604 showing a population growth of 31.0% in the area during that time. The predominant age group in Donnybrook is 60-69 years. Households in Donnybrook are primarily childless couples and are likely to be repaying $1400 – $1799 per month on mortgage repayments. In general, people in Donnybrook work in a trades occupation. In 2011, 68.1% of the homes in Donnybrook were owner-occupied compared with 70.4% in 2016.