St Mary's School
Updated Oct 2026 · ACARA 2025Colac, Victoria 3250 · Colac Otway LGA
#773 of 1,290 primary schools in VIC
#2317 of 4,908 nationally
About St Mary's School
St Mary's School is a catholic primary school located in Colac, Victoria (3250), within the Colac Otway local government area. It caters for students from Prep to 6 and in 2025 enrolled 266 students (129 girls and 137 boys). The school is affiliated with Victorian Catholic Education Authority.
St Mary's School has an ICSEA value of 1025, indicating a socio-educational profile close to the national average of 1000. That places it in the 58th percentile of Australian schools. 12% of students come from the top socio-educational quarter and 25% from the bottom quarter.
The school employs 26 teachers (19.9 full-time equivalent) and 20 non-teaching staff, giving a student-to-teacher ratio of about 13.3 to 1. Enrolments have fallen by 9% over the past five years.
On the Success Index, St Mary's School scores 55.1 out of 100, placing it in the top 50% of primary schools nationally and 773rd of 1,290 primary schools in VIC (2nd of 6 in the Colac Otway area).
Success Index breakdown
Each component is a percentile against schools of the same type across Australia.
- Socio-educational advantage (ICSEA) (50%)ICSEA 1025
- Students in the top advantage quarter (15%)12% of students
- Teacher resourcing (students per teacher) (15%)13.3 students per teacher
- Enrolment growth vs local area (5 years) (10%)-9% enrolments since 2020 (area median -6%)
- ICSEA trend (5 years) (10%)+4 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 266 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.
Colac West Primary School
Colac · Government primary · Prep-6
62 students · ICSEA 899 · 528 m away
Colac Primary School
Colac · Government primary · Prep-6
164 students · ICSEA 946 · 1.2 km away
Colac South West Primary School
Colac · Government primary · Prep-6
129 students · ICSEA 948 · 1.5 km away
Lake Colac School
Colac · Government special · U
82 students · ICSEA 933 · 1.7 km away
Colac Secondary College
Colac · Government high school · 7-12
476 students · ICSEA 955 · 1.9 km away
Trinity College Colac
Colac · Catholic high school · 7-12
744 students · ICSEA 1015 · 1.9 km away
Sacred Heart School
Elliminyt · Catholic primary · Prep-6
398 students · ICSEA 1025 · 2.1 km away
Elliminyt Primary School
Elliminyt · Government primary · Prep-6
229 students · ICSEA 996 · 3.0 km away
St Brendan's School
Coragulac · Catholic primary · Prep-6
37 students · ICSEA 977 · 9.2 km away
Alvie Primary School
Alvie · Government primary · Prep-6
78 students · ICSEA 968 · 13 km away
Similar schools
Catholic primary schools in VIC with a comparable ICSEA.
Sacred Heart School
Elliminyt · Catholic primary · Prep-6
398 students · ICSEA 1025
St Paul's Kealba Catholic School
Kealba · Catholic primary · Prep-6
257 students · ICSEA 1025
St Mary's School
Bairnsdale · Catholic primary · Prep-6
473 students · ICSEA 1024
St Mary's School
Warracknabeal · Catholic primary · Prep-6
74 students · ICSEA 1026
St Patrick's School
Stawell · Catholic primary · Prep-6
150 students · ICSEA 1026
St Colman's School
Mortlake · Catholic primary · Prep-6
39 students · ICSEA 1026
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 Victorian Catholic Education Authority.
What year levels does St Mary's School offer?
St Mary's School offers Prep 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 266 enrolled students (129 girls, 137 boys), a change of -9% 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 1025. 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 VIC?
St Mary's School ranks 773rd of 1,290 primary schools in Victoria on the Success Index (55.1/100), and 2317th of 4,908 nationally.
What is the student-to-teacher ratio at St Mary's School?
St Mary's School has about 13.3 students per full-time-equivalent teacher, based on 2025 ACARA staffing data.
How many students start Prep at St Mary's School each year?
In 2025, St Mary's School had 46 students in Prep and 37 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 10 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 Torquay, about 65 km from the school. Success Tutoring offers a free academic assessment to identify your child's strengths and learning gaps before any sessions begin.