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Western Australia · Postcode 6401
Southern Brook postcode and suburb data
Western Australia · Phone area code 08 · 102 km from Perth
Suburb snapshot
Southern Brook at a glance vs WA
Fast facts and benchmark bars show the suburb's key postcode, Census, SEIFA, school and LGA signals in context.
Quick facts
Benchmarks against WA
Income, rent and SEIFA figures are from the ABS 2021 Census and are reported in 2021 dollars, not adjusted for subsequent inflation.
Detailed comparison table
Southern Brook vs the WA average and the national average, using population-weighted 2021 Census data.
| Metric | Southern Brook | WA avg | AU avg |
|---|---|---|---|
| Household income/wk | $1,874 ≈WA | $1,891 | $1,836 |
| Rent/wk | $150 -WA | $355 | $390 |
| Mortgage/month | $1,900 ≈WA | $1,890 | $1,958 |
| Median age | 42 | 43.0 | 45.0 |
| SEIFA decile | 8/10 +WA | 6.0/10 | 6.0/10 |
| Unemployment | 0.0% -WA | 5.0% | 5.0% |
Green pill = at least 10% above the WA average; red = at least 10% below; grey = within 10%. For unemployment, colour polarity is inverted: lower is better.
Southern Brook is a locality 102 km from Perth in Western Australia, classified as outer regional by the ABS. The postcode is 6401. It falls within the Western Australia - Wheat Belt region. The local government area is Northam.
According to the 2021 Census, Southern Brook has a population of 91 with a median age of 42. The median weekly household income is $1,874, close to the WA average.
Housing in Southern Brook includes a median weekly rent of $150, median monthly mortgage repayment of $1,900, with 28 total dwellings. Housing costs in the area sit below the WA average. Owner-occupied dwellings (owned or mortgaged) make up 85.7% of housing.
On the SEIFA Index of Relative Socio-economic Advantage and Disadvantage, Southern Brook scores in decile 8 out of 10, which is above the national average.
Southern Brook is part of the Wheat Belt - North statistical area in Western Australia.
Southern Brook details
Location, Census, housing, SEIFA and geography fields used across this profile.
| Postcode | 6401 |
| State | Western Australia (WA) |
| Phone Area Code | 08 |
| Population (2021) | 91 |
| Median Age | 42 years |
| Median Household Income (Census 2021) | $1,874/week |
| Median Personal Income (Census 2021) | $725/week |
| Median Weekly Rent (Census 2021) | $150 |
| Median Monthly Mortgage (Census 2021) | $1,900 |
| Average Household Size | 3.2 persons |
| Area | 113.0 km² |
| Population Density | 1/km² |
| Total Dwellings | 28 |
| Australian Citizens | 83.5% |
| Unemployment Rate | 0.0% |
| SEIFA IRSAD Decile | 8/10 (above average) |
| Latitude | -31.5589564 |
| Longitude | 116.8302778 |
| Distance from Perth | 102 km |
| Region (SA4) | Western Australia - Wheat Belt |
| Area (SA3) | Wheat Belt - North |
| Local Government | Northam |
| Federal Electorate | Pearce |
| State Electorate | Moore (Agricultural) |
| Time Zone | AWST (UTC+8), Australia/Perth (standard time) |
Age Profile
Show counts
| 0–14 years | 28 (30.8%) |
| 15–24 years | 11 (12.1%) |
| 25–44 years | 14 (15.4%) |
| 45–64 years | 35 (38.5%) |
| 65+ years | 8 (8.8%) |
Housing Tenure
SEIFA socio-economic index
Health Conditions (2021 Census)
| Asthma | 6 (6.6%) |
| Diabetes | 5 (5.5%) |
| Heart Disease | 4 (4.4%) |
| Cancer | 3 (3.3%) |
Long-term health conditions self-reported in the 2021 Census. Persons may report more than one condition.
Motor Vehicles per Dwelling
| No vehicle | 0 (0.0%) |
| 1 vehicle | 6 (27.3%) |
| 2 vehicles | 4 (18.2%) |
| 3+ vehicles | 12 (54.5%) |
Suburbs Near Southern Brook
Same Postcode (6401)
More Southern Brook 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.