St Mary's School
Updated Oct 2026 · ACARA 2025Merredin, Western Australia 6415 · Merredin LGA
#299 of 583 primary schools in WA
#2727 of 4,908 nationally
About St Mary's School
St Mary's School is a catholic primary school located in Merredin, Western Australia (6415), within the Merredin local government area. It caters for students from PP to 6 and in 2025 enrolled 118 students (60 girls and 58 boys). The school is affiliated with Catholic Education Western Australia.
St Mary's School has an ICSEA value of 1015, indicating a socio-educational profile close to the national average of 1000. That places it in the 54th percentile of Australian schools. 16% of students come from the top socio-educational quarter and 19% from the bottom quarter.
The school employs 11 teachers (7.8 full-time equivalent) and 9 non-teaching staff, giving a student-to-teacher ratio of about 15.1 to 1. Enrolments have fallen by 11% over the past five years.
On the Success Index, St Mary's School scores 49.6 out of 100, placing it in the top 50% of primary schools nationally and 299th of 583 primary schools in WA.
Success Index breakdown
Each component is a percentile against schools of the same type across Australia.
- Socio-educational advantage (ICSEA) (50%)ICSEA 1015
- Students in the top advantage quarter (15%)16% of students
- Teacher resourcing (students per teacher) (15%)15.1 students per teacher
- Enrolment growth vs local area (5 years) (10%)-11% enrolments since 2020
- ICSEA trend (5 years) (10%)-17 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 St Mary's School's 118 students are spread across year levels in 2025.
Enrolment trend
How enrolments at St Mary's School have changed over the past decade.
Free academic assessment
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Schools near St Mary's School
Closest schools by straight-line distance, with their Success Index.
Similar schools
Catholic primary schools in WA with a comparable ICSEA.
St Gerard's Catholic Primary School
Westminster · Catholic primary · PP-6
176 students · ICSEA 1015
Mary MacKillop Catholic Community Primary School
Ballajura · Catholic primary · PP-6
393 students · ICSEA 1016
St John Paul II Catholic Primary School
Banksia Grove · Catholic primary · PP-6
230 students · ICSEA 1011
St Mary's School
Donnybrook · Catholic primary · PP-6
113 students · ICSEA 1019
St Anne's School
Harvey · Catholic primary · PP-6
164 students · ICSEA 1011
St Paul's Primary School
Karratha · Catholic primary · PP-6
339 students · ICSEA 1019
Frequently asked questions
Is St Mary's School a public or private school?
St Mary's School is a Catholic school, which makes it a non-government (private) school affiliated with Catholic Education Western Australia.
What year levels does St Mary's School offer?
St Mary's School offers PP to 6. It is classified by ACARA as a primary school.
How many students attend St Mary's School?
In 2025, St Mary's School had 118 enrolled students (60 girls, 58 boys), a change of -11% over five years.
What is the ICSEA of St Mary's School?
St Mary's School has an ICSEA (Index of Community Socio-Educational Advantage) of 1015. The national average is 1000, so this indicates a socio-educational profile close to the national average of 1000. ICSEA reflects the school community, not teaching quality.
How does St Mary's School rank in WA?
St Mary's School ranks 299th of 583 primary schools in Western Australia on the Success Index (49.6/100), and 2727th of 4,908 nationally.
What is the student-to-teacher ratio at St Mary's School?
St Mary's School has about 15.1 students per full-time-equivalent teacher, based on 2025 ACARA staffing data.
How many students start Pre-primary at St Mary's School each year?
In 2025, St Mary's School had 10 students in Pre-primary and 24 in Year 6.
Is St Mary's School co-ed?
Yes. St Mary's School is a co-educational school enrolling both girls and boys.
What other schools are near St Mary's School?
There are 1 other schools within 15 km of St Mary's School in our database. Scroll up to the "Nearby schools" section to compare them by Success Index, ICSEA and enrolments, or use the Compare tool.
Where can I get tutoring near St Mary's School?
The closest Success Tutoring centre is Success Tutoring Ellenbrook, about 220 km from the school. Success Tutoring offers a free academic assessment to identify your child's strengths and learning gaps before any sessions begin.