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South Australia · Postcode 5723
Mount Willoughby postcode and suburb data
South Australia · Phone area code 08 · 836 km from Adelaide
Suburb snapshot
Mount Willoughby at a glance vs SA
Fast facts and benchmark bars show the suburb's key postcode, Census, SEIFA, school and LGA signals in context.
Quick facts
Benchmarks against SA
Income, rent and SEIFA figures are from the ABS 2021 Census and are reported in 2021 dollars, not adjusted for subsequent inflation.
Where Mount Willoughby ranks: household income is in the top 10% of SA suburbs.
ABS Census 2021 · SEIFA 2021Detailed comparison table
Mount Willoughby vs the SA average and the national average, using population-weighted 2021 Census data.
| Metric | Mount Willoughby | SA avg | AU avg |
|---|---|---|---|
| Household income/wk | $3,250 +SA | $1,545 | $1,836 |
| Median age | 59 | 45.0 | 45.0 |
| SEIFA decile | 4/10 ≈SA | 5.0/10 | 6.0/10 |
| Unemployment | 0.0% -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.
Mount Willoughby is a very remote community in South Australia, with postcode 5723. It lies roughly 836 km from Adelaide, classified by the ABS as very remote Australia. The area is administered by Unincorporated SA.
According to the 2021 Census, Mount Willoughby has a population of 17 with a median age of 59. The median weekly household income is $3,250, above the SA average. The Indigenous population is 4 (23.5% of residents).
On the SEIFA Index of Relative Socio-economic Advantage and Disadvantage, Mount Willoughby scores in decile 4 out of 10, which is below the national average.
Mount Willoughby is part of the Outback - North and East statistical area in South Australia.
Mount Willoughby details
Location, Census, housing, SEIFA and geography fields used across this profile.
| Postcode | 5723 |
| State | South Australia (SA) |
| Phone Area Code | 08 |
| Population (2021) | 17 |
| Median Age | 59 years |
| Median Household Income (Census 2021) | $3,250/week |
| Median Personal Income (Census 2021) | $1,024/week |
| Average Household Size | 4.3 persons |
| Area | 21470.5 km² |
| Population Density | 0/km² |
| Australian Citizens | 76.5% |
| Indigenous Population | 4 (23.5%) |
| Unemployment Rate | 0.0% |
| SEIFA IRSAD Decile | 4/10 (below average) |
| Latitude | -28.4234 |
| Longitude | 134.168 |
| Distance from Adelaide | 836 km |
| Region (SA4) | South Australia - Outback |
| Area (SA3) | Outback - North and East |
| Local Government | Unincorporated SA |
| Federal Electorate | Grey |
| State Electorate | Stuart |
| Time Zone | ACST (UTC+9:30), Australia/Adelaide (standard time) |
Age Profile
Show counts
| 0–14 years | 3 (17.6%) |
| 15–24 years | 0 (0.0%) |
| 25–44 years | 0 (0.0%) |
| 45–64 years | 7 (41.2%) |
| 65+ years | 4 (23.5%) |
Housing Tenure
SEIFA socio-economic index
Health Conditions (2021 Census)
| Arthritis | 3 (17.6%) |
Long-term health conditions self-reported in the 2021 Census. Persons may report more than one condition.
Suburbs Near Mount Willoughby
Same Postcode (5723)
More Mount Willoughby 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.