The size of Wonboyn is approximately 22.1 square kilometres. It has 3 parks covering nearly 46.1% of total area. The population of Wonboyn in 2011 was 241 people. By 2016 the population was 100 showing a population decline of 58.5% in the area during that time. The predominant age group in Wonboyn is 60-69 years. Households in Wonboyn are primarily childless couples and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Wonboyn work in a managers occupation. In 2011, 85% of the homes in Wonboyn were owner-occupied compared with 85.4% in 2016. Currently the median sales price of houses in the area is $200,000.