Onslow
WAOnslow is a declining suburb in WA with 829 residents.
- SAL code
- 51181
- SA2
- 510031271
- Population
- 829
Onslow, WA had 829 residents at the 2021 Census, with the broader statistical area showing a 6.6% decline over the last five years. The predominant age group is 25-34 years, and the median age sits at 35. Households are most often couples without children, and those with a mortgage repay a median of $1,825 a month. Around 20.5% of homes are owner-occupied, with the largest single tenure being rented at 53.0%. Most dwellings are separate houses, making up 88.4% of the suburb's housing stock. The suburb has 5 parks and reserves mapped within its boundary. Source: ABS Census 2021 and Estimated Resident Population, with amenity counts from state Open Data and OpenStreetMap.
Population
?829
Suburb · Census 2021
5-Year Growth
-6.6%
3yr: +6.1% · 10yr: -35.9%
SA2 · 5yr
Household Income
$2,596/wk
Suburb · Census 2021 median
Median Age
35
Suburb · Census 2021
Socio-Economic Index
?6/10
SA2 · middle-range
Unemployment
?1.0%
SA2 · Q4 2025
Schools
1
1 primary
Hospitals
?1
Within suburb
Childcare services
?1
1 long day, 1 OSHC
Parks & green space
?5
Parks, reserves
Transport stops
No data for this suburb
Dwelling approvals
No data for this suburb
Median Weekly Rent
Based on rental bond lodgements recorded by the state government.
Median House Sale Price
state Valuer-General sale price data not yet loaded for WA
Safety & Crime
2025 Q4Reported incidents from WA police. Offence rates may not reflect all crime.
Population over time — Ashburton (WA) (SA2)
ABS publishes annual estimates only at SA2; Onslow suburb alone is ~829 (Census 2021).
Source: ABS ERP (latest release · 2025) · Census 2021. Numbers refreshed quarterly.
Growth at a Glance
Population grew from 5,969 to 8,335 over 24 years, averaging 1.4% per year.
Schools
1 in suburbSector
1 public
Type
1 primary
Total enrolment
169
Avg per school
169
Government school catchment
Catchment data is not yet available for WA.
Source when available: WA Department of Education — Public School Local-Intake Areas.
Profile
Census snapshot
Housing
Public housing 4.3%Almost entirely detached houses (88.4%), rental-heavy (53% renting), built for families (42% are 3 bed).
Dwelling mix
Tenure
WA 27%
Number of bedrooms
Bushfire risk
Source: WA DFES Bush Fire Prone Areas
As of Apr 2026
Overlap is the percentage of the suburb's land area inside the mapped bushfire polygons. Always verify the exact property address with the relevant authority before making decisions.
Flood risk
Flood data is not yet available for WA.
Overlap is the percentage of the suburb's land area inside the mapped flood polygons. Always verify the exact property address with the relevant authority before making decisions. Source when available: WA DFES Bush Fire Prone Areas and DWER Floodplain Mapping.
Planning zones
Planning-zone data is not yet available for WA.
Source when available: Landgate / WA Department of Planning, Lands and Heritage.