Onslow School
Updated Oct 2026 · ACARA 2025Onslow, Western Australia 6710 · Ashburton LGA
#135 of 172 combined schools in WA
#1052 of 1,259 nationally
About Onslow School
Onslow School is a public combined (K–12) school located in Onslow, Western Australia (6710), within the Ashburton local government area. It caters for students from K to 12 and in 2025 enrolled 166 students (75 girls and 91 boys).
Onslow School has an ICSEA value of 884, indicating a community facing significant socio-educational disadvantage. That places it in the 8th percentile of Australian schools. 9% of students come from the top socio-educational quarter and 47% from the bottom quarter.
The school employs 16 teachers (15.6 full-time equivalent) and 16 non-teaching staff, giving a student-to-teacher ratio of about 10.3 to 1. Enrolments have grown by 41% over the past five years.
On the Success Index, Onslow School scores 31.0 out of 100, placing it in the lower 50% of combined schools nationally and 135th of 172 combined schools in WA (1st of 2 in the Ashburton area).
Success Index breakdown
Each component is a percentile against schools of the same type across Australia.
- Socio-educational advantage (ICSEA) (50%)ICSEA 884
- Students in the top advantage quarter (15%)9% of students
- Teacher resourcing (students per teacher) (15%)10.3 students per teacher
- Enrolment growth vs local area (5 years) (10%)+41% enrolments since 2020
- ICSEA trend (5 years) (10%)-78 ICSEA points since 2020
The Success Index summarises the academic environment of a school community using official ACARA data. It is not a measure of teaching quality or student results. Read the methodology.
Student profile
Distribution of students across socio-educational advantage (SEA) quarters, plus community characteristics.
Enrolments by year level
How Onslow School's 166 students are spread across year levels in 2025.
Enrolment trend
How enrolments at Onslow School have changed over the past decade.
Free academic assessment
Is your child on track at Onslow School?
Rankings tell you about a school community. A free Success Tutoring assessment tells you about your child: exactly where they are in English and Maths, where the gaps are, and a plan to close them. Small-group, Australian-curriculum tutoring with no lock-in contracts.
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Similar schools
Government combined schools in WA with a comparable ICSEA.
Northampton District High School
Northampton · Government combined · K-10
138 students · ICSEA 884
Quairading District High School
Quairading · Government combined · K-12
133 students · ICSEA 879
Carnamah District High School
Carnamah · Government combined · K-12
58 students · ICSEA 892
Southern Cross District High School
Southern Cross · Government combined · K-12
54 students · ICSEA 874
Wyalkatchem District High School
Wyalkatchem · Government combined · K-12
46 students · ICSEA 870
Shark Bay School
Denham · Government combined · K-12
85 students · ICSEA 901
Frequently asked questions
Is Onslow School a public or private school?
Onslow School is a public (government) school run by the Western Australia education department.
What year levels does Onslow School offer?
Onslow School offers K to 12. It is classified by ACARA as a combined school.
How many students attend Onslow School?
In 2025, Onslow School had 166 enrolled students (75 girls, 91 boys), a change of 41% over five years.
What is the ICSEA of Onslow School?
Onslow School has an ICSEA (Index of Community Socio-Educational Advantage) of 884. The national average is 1000, so this indicates a community facing significant socio-educational disadvantage. ICSEA reflects the school community, not teaching quality.
How does Onslow School rank in WA?
Onslow School ranks 135th of 172 combined schools in Western Australia on the Success Index (31.0/100), and 1052nd of 1,259 nationally.
What is the student-to-teacher ratio at Onslow School?
Onslow School has about 10.3 students per full-time-equivalent teacher, based on 2025 ACARA staffing data.
How big is the Year 7 cohort at Onslow School?
In 2025, Onslow School had 7 students in Year 7 and 4 in Year 12.
Is Onslow School co-ed?
Yes. Onslow School is a co-educational school enrolling both girls and boys.
Where can I get tutoring near Onslow School?
The closest Success Tutoring centre is Success Tutoring Joondalup, about 1124 km from the school. Success Tutoring offers a free academic assessment to identify your child's strengths and learning gaps before any sessions begin.