The size of Mount Gambier is approximately 26.8 square kilometres. It has 91 parks covering nearly 13.5% of total area. The population of Mount Gambier in 2011 was 24,905 people. By 2016 the population was 25,511 showing a population growth of 2.4% in the area during that time. The predominant age group in Mount Gambier is 0-9 years. Households in Mount Gambier are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Mount Gambier work in a trades occupation. In 2011, 61.7% of the homes in Mount Gambier were owner-occupied compared with 61.3% in 2016. Currently the median sales price of houses in the area is $300,000.