Suburb report · SA 5290
Mount Gambier
Prepared by the property strategists at Chase Wealth Australia
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Population
26,265
Mount Gambier suburb profile
Who lives in Mount Gambier
Mount Gambier is a regional centre 376km from the Adelaide CBD. Mount Gambier is one of the most populous suburbs in South Australia, with 26,265 residents, more than 99% of the state's suburbs. No other of the 89 South Australian suburbs and towns more than 40km from the Adelaide CBD has more residents. Mount Gambier has a median age of 41, near the state's median suburb at 41. Of the 89 South Australian suburbs and towns more than 40km from the Adelaide CBD, 16 have a younger median age.
Income and home ownership
Median household income is $67,300 a year, lower than 83% of South Australian suburbs. Among the 89 South Australian suburbs and towns more than 40km from the Adelaide CBD, 43 report a higher median household income. A renting share of 34.2% is above the state norm, where the median suburb has 73.1% ownership. On ownership it ranks 74 of 89 South Australian suburbs and towns more than 40km from the Adelaide CBD.
Household mix
At the 2021 Census, 10,528 households lived in Mount Gambier, more than in 99% of South Australian suburbs. The household mix leans to families: families with children 35.8%, couples without children 27.1%, people living alone 34.9% and group households 2.3%. Among South Australian suburbs and towns more than 40km from the Adelaide CBD, 60 of 89 have a smaller share of families with children than Mount Gambier. The share of people living alone, 34.9%, is higher than in 81% of South Australian suburbs. Couples without children, at 27.1%, sit near the South Australian middle, at the 49th percentile.
Housing supply
79 new dwellings were approved across the Mount Gambier-West statistical area in the year to June 2025, 7% under its 2020 to 2024 average of 85 a year. The Mount Gambier-West statistical area had 15,284 residents in 2025 and covers only part of Mount Gambier. That is 5.2 approvals per 1,000 residents of that area, close to the 5.2 of a typical South Australian statistical area. Over the 6 years to June 2025, annual approvals ranged from 45 in 2020 to 129 in 2021.
Population trend
From 2020 to 2025, the Mount Gambier-West statistical area added 3.4% to its population, against 6.3% for South Australia as a whole. Over those 5 years a typical South Australian statistical area added 4.8%, putting this area 1.4 points behind. That rate is faster than 36% of South Australian statistical areas. Growth was strongest in the year to 2022 (1.3%) and weakest in the year to 2025 (0.2%).
Against its neighbours
The sharpest contrast among the suburbs profiled in the region is Mount Barker, where the share of people living alone is 25.3% compared with 34.9% here. Murray Bridge matches Mount Gambier on the share of people living alone, at 34.9%. Aldinga Beach, 351km away, has 11,316 residents and a median household income of $72,100.
Location
Demographics
ABS Data by Region to 2025, on ABS Census 2021 suburb baselineHousehold Mix Census 2021
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Reading this report
Every figure in the Mount Gambier data table is dated at its source. Supply and population change cover the Mount Gambier-West statistical area, whose boundary differs from Mount Gambier's, and our guide to reading a suburb report explains how our buyers agents weigh them.
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This report is market intelligence prepared by Chase Wealth Australia for general information only. Figures are statistical estimates for the suburb, not valuations of any individual property, and do not constitute financial or credit advice. Consider your circumstances and seek professional advice before acting. Demographic figures are sourced from the Australian Bureau of Statistics, Census 2021 (licensed CC BY 4.0) where available.