The size of Mount Gambier is approximately 26.8 square kilometres. It has 114 parks covering nearly 24.0% of total area. The population of Mount Gambier in 2016 was 25512 people. By 2021 the population was 25591 showing a population growth of 0.3% in the area during that time. The predominant age group in Mount Gambier is 50-59 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 community and personal service occupation.In 2021, 62.70% of the homes in Mount Gambier were owner-occupied compared with 61.30% in 2016..
Mount Gambier has 13,854 properties. Over the last 5 years, Houses in Mount Gambier have seen a 100.85% increase in median value, while Units have seen a 89.07% increase. As at 31 May 2025:
$489k
14.79%
View Trend$450/W
4.91%
$337k
8.02%
View Trend$320/W
4.91%
Population 25,591
0-9
12%
10-19
13%
20-29
12%
30-39
12%
40-49
11%
50-59
13%
60-69
12%
70-79
10%
80-89
5%
90-99
1%