Mount Gambier
28,057 residents (ABS estimated resident population, 30 June 2025) across 34 km², 2 suburbs. Council website: mountgambier.sa.gov.au.
Council series run to July 2026.
Population
28,057
ABS estimated resident population, 30 June 2025 · +0.1% in a year
Density
828/km²
34 km² · ERP 2025 over the ABS 2024 boundary
Council-wide house median
$465k
Established-house transfers across the whole council, FY 2023-24 (ABS)
Federal grants per resident
$158
Financial Assistance Grant 2025-26 over ERP 2025
Dwelling approvals
6.3 per 1,000
Residents, 12 months to July 2026 (ABS Building Approvals)
Advantage decile
2 of 10
SEIFA 2021 IRSAD, national (10 = most advantaged)
Suburbs
2
Where it holds most residents (ABS mesh-block allocation)
Trends
Council-level series. Each chart names its source and period.
People and housing
Council-wide figures from the ABS Census of 2021 and SEIFA 2021 (national deciles, 10 = most advantaged).
- Median age
- 41
- Median household income
- $1,232/week
- Median rent
- $220/week
- Median mortgage repayment
- $1,127/month
- Households renting
- 31.6%
- Average household
- 2.3 people
- Advantage and disadvantage (IRSAD)
- decile 2 of 10
- Disadvantage (IRSD)
- decile 2 of 10
Suburbs
2 suburbs where Mount Gambier holds most residents, plus 3 it shares with a neighbouring council (share of residents shown). Population is Census 2021 for the whole suburb. A median here is the suburb’s own Valuer-General median — suburbs without one are blank, never filled with the council figure.
| Suburb | Population | In this council | Median house (VG) | Flood / bushfire | IRSAD |
|---|---|---|---|---|---|
| Mount Gambier | 25,591 | All | 0% / 41% | 1 | |
| Worrolong | 1,293 | 66% | – / 97% | 7 | |
| Suttontown | 692 | 40% | – / 96% | 7 | |
| Ob Flat | 470 | 18% | – / 100% | 8 | |
| Glenburnie | 396 | 16% | – / 100% | 5 |
Hazards
Share of each member suburb's land inside the mapped layer, averaged across the council weighted by the residents each suburb contributes. Only suburbs a source covers count; the rest are left out, not counted as zero.
Flood planning land
0%
Over 1 of 5 member suburbs (the rest are not mapped)
Show the layer on the map →Representation
Federal electorates and state districts covering the council, by share of the residents its suburbs contribute (each suburb counts once, for the seat containing a representative interior point).
Federal electorates
- Barker · Tony PASIN (LP)100%
State districts
- Mount Gambier · Troy Bell (IND)100%
Neighbouring councils
Councils in the same state whose suburbs share a boundary with this one's, and councils it splits a suburb with.
Compare it with every South Australia council on the council map or the South Australia council list.
Boundaries: ABS ASGS Edition 3, LGA 2024 boundaries; suburbs allocated by 2021 mesh block, weighted by Census 2021 residents. Population: ABS estimated resident population 2025. Census 2021 and SEIFA 2021: ABS. Council-wide medians: ABS Data by Region. Approvals: ABS Building Approvals. Grants: Financial Assistance Grants, Dept of Infrastructure. Flood and bushfire: state planning layers. Observed water: Geoscience Australia DEA Water Observations. Website and identity: Wikidata (CC0). ABS, Dept of Infrastructure and state government data CC BY 4.0. Council facts loaded 2026-09-24.