Western Australia · Postcode 6403
Grass Valley postcode and suburb data
Western Australia · Phone area code 08 · 97 km from Perth
Suburb snapshot
Grass Valley 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.
Where Grass Valley ranks: household income sits in the bottom 25% of WA suburbs.
ABS Census 2021 · SEIFA 2021Detailed comparison table
Grass Valley vs the WA average and the national average, using population-weighted 2021 Census data.
| Metric | Grass Valley | WA avg | AU avg |
|---|---|---|---|
| Household income/wk | $1,125 -WA | $1,891 | $1,836 |
| Rent/wk | $225 -WA | $355 | $390 |
| Mortgage/month | $986 -WA | $1,890 | $1,958 |
| Median age | 52 | 43.0 | 45.0 |
| SEIFA decile | 3/10 -WA | 6.0/10 | 6.0/10 |
| Unemployment | 8.5% +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.
Grass Valley is a locality 97 km from Perth in Western Australia, classified as inner regional by the ABS. The postcode is 6403. It falls within the Western Australia - Wheat Belt region. The local government area is Northam.
According to the 2021 Census, Grass Valley has a population of 158 with a median age of 52. The median weekly household income is $1,125, below the WA average. The unemployment rate is 8.5%, higher than the WA average. The Indigenous population is 7 (4.4% of residents).
Housing in Grass Valley includes a median weekly rent of $225, median monthly mortgage repayment of $986, with 64 total dwellings. Housing costs in the area sit below the WA average. Owner-occupied dwellings (owned or mortgaged) make up 80.0% of housing.
On the SEIFA Index of Relative Socio-economic Advantage and Disadvantage, Grass Valley scores in decile 3 out of 10, which is below the national average.
Grass Valley is part of the Wheat Belt - North statistical area in Western Australia.
Grass Valley details
Location, Census, housing, SEIFA and geography fields used across this profile.
| Postcode | 6403 |
| State | Western Australia (WA) |
| Phone Area Code | 08 |
| Population (2021) | 158 |
| Median Age | 52 years |
| Median Household Income (Census 2021) | $1,125/week |
| Median Personal Income (Census 2021) | $547/week |
| Median Weekly Rent (Census 2021) | $225 |
| Median Monthly Mortgage (Census 2021) | $986 |
| Average Household Size | 2.2 persons |
| Area | 60.1 km² |
| Population Density | 3/km² |
| Total Dwellings | 64 |
| Australian Citizens | 86.7% |
| Indigenous Population | 7 (4.4%) |
| Unemployment Rate | 8.5% |
| SEIFA IRSAD Decile | 3/10 (below average) |
| Latitude | -31.636653 |
| Longitude | 116.8203511 |
| Distance from Perth | 97 km |
| Region (SA4) | Western Australia - Wheat Belt |
| Area (SA3) | Wheat Belt - North |
| Local Government | Northam |
| Federal Electorate | Pearce |
| State Electorate | Central Wheatbelt (Agricultural) |
| Time Zone | AWST (UTC+8), Australia/Perth (standard time) |
Age Profile
Show counts
| 0–14 years | 18 (11.4%) |
| 15–24 years | 21 (13.3%) |
| 25–44 years | 32 (20.3%) |
| 45–64 years | 54 (34.2%) |
| 65+ years | 40 (25.3%) |
Housing Tenure
SEIFA socio-economic index
Health Conditions (2021 Census)
| Arthritis | 23 (14.6%) |
| Heart Disease | 14 (8.9%) |
| Lung Condition | 13 (8.2%) |
| Diabetes | 12 (7.6%) |
| Asthma | 9 (5.7%) |
| Cancer | 6 (3.8%) |
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 | 20 (28.6%) |
| 2 vehicles | 19 (27.1%) |
| 3+ vehicles | 31 (44.3%) |
Suburbs Near Grass Valley
More Grass Valley 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.