The size of Wonthaggi is approximately 52.4 square kilometres. It has 4 parks covering nearly 1.7% of total area. The population of Wonthaggi in 2011 was 4,354 people. By 2016 the population was 4,964 showing a population growth of 14.0% in the area during that time. The predominant age group in Wonthaggi is 60-69 years. Households in Wonthaggi are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Wonthaggi work in a trades occupation. In 2011, 63.7% of the homes in Wonthaggi were owner-occupied compared with 62.9% in 2016. Currently the median sales price of houses in the area is $550,000.