Lock Postcode
South Australia
Income, rent and SEIFA figures are from the ABS 2021 Census and are reported in 2021 dollars, not adjusted for subsequent inflation.
How Lock Compares
Lock vs the SA average and the national average (2021 Census, population-weighted).
| Metric | Lock | SA avg | AU avg |
|---|---|---|---|
| Household income/wk | $1,125 -SA | $1,545 | $1,836 |
| Rent/wk | $120 -SA | $308 | $390 |
| Mortgage/month | $512 -SA | $1,558 | $1,958 |
| Median age | 38 | 45.0 | 45.0 |
| SEIFA decile | 5/10 ≈SA | 5.0/10 | 6.0/10 |
| Unemployment | 5.5% ≈SA | 6.0% | 5.0% |
Green pill = at least 10% above the SA average; red = at least 10% below; grey = within 10%. For unemployment, colour polarity is inverted: lower is better.
Lock is a remote community in South Australia, with postcode 5633. It lies roughly 302 km from Adelaide, classified by the ABS as remote Australia. The area is administered by Elliston.
According to the 2021 Census, Lock has a population of 253 with a median age of 38. The median weekly household income is $1,125, below the SA average. The unemployment rate is 5.5%. The Indigenous population is 7 (2.8% of residents).
Housing in Lock includes a median weekly rent of $120, median monthly mortgage repayment of $512, with 88 total dwellings. Housing costs in the area sit below the SA average. Owner-occupied dwellings (owned or mortgaged) make up 72.0% of housing.
On the SEIFA Index of Relative Socio-economic Advantage and Disadvantage, Lock scores in decile 5 out of 10, which is around the national average.
Lock is served by Lock Area School.
Lock is part of the Eyre Peninsula and South West statistical area in South Australia.
Lock Details
| Postcode | 5633 |
| State | South Australia (SA) |
| Phone Area Code | 08 |
| Population (2021) | 253 |
| Median Age | 38 years |
| Median Household Income (Census 2021) | $1,125/week |
| Median Personal Income (Census 2021) | $729/week |
| Median Weekly Rent (Census 2021) | $120 |
| Median Monthly Mortgage (Census 2021) | $512 |
| Average Household Size | 2.2 persons |
| Area | 637.1 km² |
| Population Density | 0/km² |
| Total Dwellings | 88 |
| Australian Citizens | 90.5% |
| Indigenous Population | 7 (2.8%) |
| Unemployment Rate | 5.5% |
| SEIFA IRSAD Decile | 5/10 (average) |
| Latitude | -33.56778 |
| Longitude | 135.7546697 |
| Distance from Adelaide | 302 km |
| Region (SA4) | South Australia - Outback |
| Area (SA3) | Eyre Peninsula and South West |
| Local Government | Elliston |
| Federal Electorate | Grey |
Age Profile
Show counts
| 0–14 years | 58 (22.9%) |
| 15–24 years | 20 (7.9%) |
| 25–44 years | 55 (21.7%) |
| 45–64 years | 76 (30.0%) |
| 65+ years | 44 (17.4%) |
Housing Tenure
SEIFA Socio-economic Index
Index of Relative Socio-economic Advantage and Disadvantage (IRSAD), decile 5 of 10. Higher deciles indicate more advantage.
Health Conditions (2021 Census)
| Arthritis | 28 (11.1%) |
| Asthma | 23 (9.1%) |
| Heart Disease | 17 (6.7%) |
| Diabetes | 14 (5.5%) |
| Lung Condition | 8 (3.2%) |
| Cancer | 8 (3.2%) |
Long-term health conditions self-reported in the 2021 Census. Persons may report more than one condition.
Motor Vehicles per Dwelling
| No vehicle | 7 (8.2%) |
| 1 vehicle | 28 (32.9%) |
| 2 vehicles | 31 (36.5%) |
| 3+ vehicles | 19 (22.4%) |
Schools in Lock
Suburbs Near Lock
Same Postcode (5633)
More Lock Data
Page last reviewed . Data sources: Australian Bureau of Statistics 2021 Census (CC BY 4.0), SEIFA 2021 IRSAD, ACARA school profiles 2025. How this data is sourced.