Mount Gambier

South Australia · South Australia - South East · 27,576 people · 3 suburbs · 2 postcodes

Mount Gambier at a glance

27,576

Population

#18 of 72 in SA

km² area

342/km² density

40.7

Median age

-0.6 vs SA

896

SEIFA IRSAD

#60 of 72 in SA

Schools

10 gov, 1 Cath, 1 indep

11.3%

Born overseas

32.6%

Renting

Map shows the Mount Gambier LGA boundary in blue with a marker per suburb. Hover for suburb name, click for details.

Marker colour reflects SEIFA IRSAD decile: ● 1-2 (most disadvantaged), ● 3-4, ● 5-6, ● 7-8, ● 9-10 (most advantaged).

Boundary source: ABS ASGS 2021. Map tiles: OpenStreetMap contributors.

Federal electorate boundaries can be toggled on the map. Boundary source: ABS ASGS 2021 CED boundaries.

Mount Gambier is a Local Government Area in South Australia, in the Adelaide region. It covers 3 suburbs across 2 postcodes and an area of 81 km². Mount Gambier has a population of 27,576 , ranking #18 most populous in SA. The most populous suburb is Mount Gambier (25,591 residents).About 11.3% of residents were born overseas and 6.7% speak a language other than English at home.

Who lives here

Age structure

18.2%

11.7%

23.8%

25.2%

21.1%

0–14 (18.2%) 15–24 (11.7%) 25–44 (23.8%) 45–64 (25.2%) 65+ (21.1%)

Show counts

0–14 years	5,017 (18.2%)
15–24 years	3,238 (11.7%)
25–44 years	6,553 (23.8%)
45–64 years	6,946 (25.2%)
65+ years	5,828 (21.1%)

11.3%

Born overseas

6.7%

Speak a language other than English at home

2.8%

First Nations

2.3

Avg household size

How they live

Housing tenure

32.3%

35.1%

32.6%

Owned outright (32.3%) Mortgaged (35.1%) Renting (32.6%)

Dwelling type mix

84.5%

10.2%

Separate house (84.5%) Semi/townhouse (10.2%) Flat/apartment (5.3%)

$228

Median weekly rent

$1,121

Median monthly mortgage

44.9%

Households with 0-1 cars

55.1%

Households with 2+ cars

Work and learning

4.7%

Unemployment rate

7,351

In full-time work

4,660

In part-time work

Schools in Mount Gambier

12 schools across Mount Gambier: 83.3% Government, 8.3% Catholic, 8.3% Independent. The SA average is 70.8% / 14.3% / 14.9%. Schools here have a median ICSEA of 952 (range 882 to 1031). SA median is 999; national mean is 1000.

Sector mix

83.3%

8.3%

SA average for comparison

70.8%

14.3%

14.9%

Government Catholic Independent

Type breakdown

58.3%

16.7%

8.3%

Primary (58.3%) Secondary (16.7%) Combined (16.7%) Special (8.3%)

ICSEA range

700 National mean 1000 1300

LGA median 952 SA median 999LGA range 882 to 1031

ICSEA (Index of Community Socio-Educational Advantage) summarises the socio-economic background of each school's families. Higher values indicate more advantage. Source: ACARA 2025.

All 12 schools in Mount Gambier, sorted by enrolment:

School	Sector	Type	Suburb	Students	ICSEA
Tenison Woods College	Catholic	Combined	Mount Gambier	1,552	1031
Grant High School	Government	Secondary	Mount Gambier	978	954
St Martins Lutheran College	Independent	Combined	Mount Gambier	810	1028
Mount Gambier High School	Government	Secondary	Mount Gambier	778	946
Reidy Park Primary School	Government	Primary	Mount Gambier	474	990
McDonald Park School	Government	Primary	Mount Gambier	379	948
Mount Gambier North Primary School	Government	Primary	Mount Gambier	190	888
Mulga Street Primary School	Government	Primary	Mount Gambier	189	943
Melaleuca Park Primary School	Government	Primary	Mount Gambier	107	882
Suttontown Primary School	Government	Primary	Suttontown	101	960
Compton Primary School	Government	Primary	Suttontown	76	980
Gordon Education Centre	Government	Special	Mount Gambier	62	951

Source: ACARA School Profiles 2025. ICSEA shown where reported; some schools (notably small primaries) do not publish ICSEA.

SEIFA socio-economic indexes

SEIFA 2021 ranks Australian areas across four dimensions. Scores are population-weighted averages of suburb-level SEIFA scores within Mount Gambier. Higher scores indicate more advantage; the national mean is 1000.

IRSAD

Relative socio-economic advantage and disadvantage

896

Ranked #60 of 72 SA LGAs

IRSD

Relative disadvantage only (lower = more disadvantaged)

928

IER

Economic resources: income, wealth, housing

932

IEO

Education and occupation: qualifications, skill levels

886

Suburbs in Mount Gambier

Mount Gambier contains 3 suburbs and 2 postcodes. Sorted by population.

Suburb	Postcode	Population	Median income	Median age
Mount Gambier	5290	25,591	$1,197/wk	41
Worrolong	5291	1,293	$2,205/wk	36
Suttontown	5291	692	$2,330/wk	38

Postcodes covered

5290, 5291

Compare Mount Gambier with neighbouring LGAs

Side-by-side demographic and socio-economic snapshot of Mount Gambier and its closest neighbouring LGAs.

LGA	Population	Median age	SEIFA IRSAD	% renting	% overseas-born
Mount Gambier (SA)	27,576	40.7	896	32.6%	11.3%
Grant	7,994	44.6	970	11.7%	7.7%
Wattle Range	11,814	48.2	906	21.1%	9.1%

Services and amenities

NDIS Providers NDIS provider directory for Mount Gambier Climate & weather Climate data for Mount Gambier

Frequently asked questions about Mount Gambier

What is the population of Mount Gambier?

The 2021 Census recorded 27,576 people living in Mount Gambier, across 3 suburbs.

What suburbs are in Mount Gambier?

Mount Gambier contains 3 suburbs. The most populous are Mount Gambier, Worrolong, Suttontown.See the full list in the Suburbs section above.

What postcodes are in Mount Gambier?

Mount Gambier covers 2 postcodes: 5290, 5291.

How many schools are in Mount Gambier?

Mount Gambier has 12 schools, including 10 government, 1 Catholic, and 1 independent schools (ACARA 2025).

What is the SEIFA score for Mount Gambier?

Mount Gambier has a population-weighted SEIFA IRSAD score of 896, where the national average is 1000. Higher scores indicate more relative advantage.

Page last reviewed June 2026. Data sources: Australian Bureau of Statistics 2021 Census (CC BY 4.0), SEIFA 2021 (IRSD, IRSAD, IER, IEO), ACARA School Profiles 2025, ABS ASGS 2021 LGA boundaries. How this data is sourced.