Suburb profile · ABS Census 2021
Lock suburb profile
Lock, SA · Postcode 5633
This Lock suburb profile summarises official Australian Bureau of Statistics Census 2021 data for Lock, SA (postcode 5633). Use it as a free suburb report covering population, median rent, household income, age, housing tenure and employment, plus how those figures changed since Census 2016— then compare Lock with nearby suburbs.
Lock at a glance
Population
253
Median rent
$120/wk
Household income
$1,125/wk
Median age
38
Lock trends (2016 → 2021)
Change since the previous Census. Historical figures are mapped from State Suburbs (SSC) to today's suburb boundaries.
Population
Census 2011 → 2016 → 2021
-17.6% over 10 years
Population
253
was 276 in 2016
-23 · -8.3%
Median rent
$120/wk
was $91/wk in 2016
+$29 · +31.9%
Household income
$1,125/wk
was $1,010/wk in 2016
+$115 · +11.4%
Median age
38
was 45 in 2016
-7 · -15.6%
Dig deeper: Lock population growth · Lock then and now
Lock vs nearby & SA
Median Census 2021 figures for Lock, nearby suburbs (8), and the SA state median (suburbs with 1,000+ people).
Rent
-62.5% vs area
- Lock$120/wk
- Nearby$172.5/wk
- SA$320/wk
Household income
-27.8% vs area
- Lock$1,125/wk
- Nearby$1,319/wk
- SA$1,559/wk
Median age
-7.3% vs area
- Lock38
- Nearby41.5
- SA41
Personal income
-6.7% vs area
- Lock$729/wk
- Nearby$780/wk
- SA$781/wk
Nearby uses the same postcode first, then larger suburbs in SA.
Socio-economic profile
How Lock compares to other Australian suburbs on income, education and occupation — from official ABS SEIFA 2021 data.
Lock sits around the national middle for socio-economic advantage. It shows limited economic resources.
Relative disadvantage (IRSD)
Decile 3976.4
Lower score / decile = more relative disadvantage
Advantage & disadvantage (IRSAD)
Decile 5973.2
Higher score / decile = more relative advantage
Economic resources (IER)
Decile 3975.8
Access to economic resources (income, housing)
Education & occupation (IEO)
Decile 81,020.5
Education and occupational skill levels
Source: ABS SEIFA 2021. See methodology.
Lock on the map
OpenStreetMap outline for Lock, SA.
Map data © OpenStreetMap contributors. Boundary matching is approximate.
Lock people
- Population
- 253
- Median age
- 38
- Born overseas
- 5.5%
- Average household size
- 2.2
Total usual residents (Census 2021)
Median age of residents in years
Percentage born outside Australia
Average number of people per household
Lock income
- Median household income
- $1,125/wk
- Median personal income
- $729/wk
Median total weekly household income
Median total weekly personal income
Lock housing
- Median rent
- $120/wk
- Median mortgage repayment
- $512/mo
- Separate houses
- 67.9%
- Flats & apartments
- 0%
- Owned outright
- 30.6%
- Mortgaged
- 13.4%
- Rented
- 17.2%
- Unoccupied dwellings
- 32.1%
Median weekly rent for rented dwellings
Median monthly mortgage repayment
Percentage of dwellings that are separate houses
Percentage of dwellings that are flats or apartments
Percentage of dwellings owned without a mortgage
Percentage of dwellings with a mortgage
Percentage of dwellings rented
Percentage of private dwellings unoccupied on Census night
Lock work
- Employment to population
- 61.5%
- Unemployment rate
- 5.5%
- Year 12 or above
- 37.9%
Employed persons as a percentage of population aged 15+
Unemployed persons as a percentage of the labour force
Percentage with Year 12 or equivalent as highest school level
Nearby suburb profiles (near 5633)
Compare Lock with nearby suburbs
Lock in numbers
Lock had 253 residents at the 2021 Census. The median age is 38, 10% below the typical SA suburb. The average household has 2.2 people. 5.5% of residents were born overseas.
Among occupied homes, 30.6% own their home outright, 13.4% are paying a mortgage, 17.2% rent. Separate houses make up 67.9% of dwellings, with 0% in flats or apartments. Median rent was $120/wk, 61% below the typical SA suburb.
Median household income was $1,125/wk, 26% below the typical SA suburb. On the ABS SEIFA index of relative socio-economic disadvantage it sits in decile 3 nationally (1 is most disadvantaged, 10 least).
Between the 2016 and 2021 Censuses the population fell 8.3% (from 276 to 253). Median rent moved from $91/wk to $120/wk (+31.9%).
Lock suburb FAQs
- What is the median rent in Lock, SA?
- The median weekly rent in Lock was $120/wk at the 2021 Census (ABS).
- How many people live in Lock, SA?
- Lock had 253 residents at the 2021 Census, down 8.3% from 2016.
- What is the median household income in Lock?
- Median household income in Lock was $1,125/wk at the 2021 Census.
- Do most people rent or own in Lock?
- 17.2% of occupied homes in Lock were rented, 30.6% were owned outright and 13.4% were owned with a mortgage.
About this Lock suburb profile
Figures are from the ABS Census of Population and Housing 2021 (General Community Profile) for the Suburbs and Localities boundary matching Lock. Where shown, 2016 values come from the 2016 State Suburbs (SSC) profile, linked via ABS geographic correspondence — boundaries are not always identical. Medians may be suppressed for very small areas. This is not financial or relocation advice — use it alongside current market data.
Source: ABS Census 2021. Methodology