St Mary's College
Updated Oct 2026 · ACARA 2025Adelaide, South Australia 5000 · Adelaide LGA
#39 of 145 combined schools in SA
#524 of 1,259 nationally
About St Mary's College
St Mary's College is a catholic girls' combined (K–12) school located in Adelaide, South Australia (5000), within the Adelaide local government area. It caters for students from R to 12 and in 2025 enrolled 659 students. The school is affiliated with Catholic Education South Australia.
St Mary's College has an ICSEA value of 1073, indicating above-average socio-educational advantage. That places it in the 76th percentile of Australian schools. 26% of students come from the top socio-educational quarter and 10% from the bottom quarter.
The school employs 70 teachers (60.9 full-time equivalent) and 42 non-teaching staff, giving a student-to-teacher ratio of about 10.8 to 1. Enrolments have fallen by 22% over the past five years.
On the Success Index, St Mary's College scores 56.4 out of 100, placing it in the top 50% of combined schools nationally and 39th of 145 combined schools in SA (5th of 5 in the Adelaide area).
Success Index breakdown
Each component is a percentile against schools of the same type across Australia.
- Socio-educational advantage (ICSEA) (50%)ICSEA 1073
- Students in the top advantage quarter (15%)26% of students
- Teacher resourcing (students per teacher) (15%)10.8 students per teacher
- Enrolment growth vs local area (5 years) (10%)-22% enrolments since 2020 (area median -5%)
- ICSEA trend (5 years) (10%)-9 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 College's 659 students are spread across year levels in 2025.
Enrolment trend
How enrolments at St Mary's College have changed over the past decade.
Free academic assessment
Is your child on track at St Mary's College?
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Schools near St Mary's College
Closest schools by straight-line distance, with their Success Index.
Adelaide High School
Adelaide · Government high school · U, 7-12
1,821 students · ICSEA 1094 · 338 m away
Sturt Street Community School
Adelaide · Government primary · R-6
162 students · ICSEA 1114 · 645 m away
Youthinc. Enterprise Academy
Adelaide · Independent special · 11-12
129 students · ICSEA 1029 · 820 m away
Temple Christian College
Mile End · Independent high school · 7-12
1,151 students · ICSEA 1043 · 1.1 km away
Muirden Senior College
Adelaide · Independent high school · 11-12
91 students · ICSEA 1079 · 1.2 km away
St Aloysius College
Adelaide · Catholic combined · R-12
1,091 students · ICSEA 1081 · 1.3 km away
Specialised Assistance School For Youth (SASY)
Adelaide · Independent high school · 8-12
205 students · ICSEA 1026 · 1.3 km away
Pulteney Grammar School
Adelaide · Independent combined · R-12
839 students · ICSEA 1170 · 1.5 km away
Gilles Street Primary School
Adelaide · Government primary · U, R-6
275 students · ICSEA 1107 · 1.6 km away
University Senior College at Adelaide University
Adelaide University · Independent high school · 10-12
523 students · ICSEA 1092 · 1.6 km away
Similar schools
Catholic combined schools in SA with a comparable ICSEA.
Christian Brothers College
Adelaide · Catholic combined · R-12
990 students · ICSEA 1074
St Joseph's School
Clare · Catholic combined · R-9
314 students · ICSEA 1074
St Dominic's Priory College
North Adelaide · Catholic combined · R-12
658 students · ICSEA 1080
St Aloysius College
Adelaide · Catholic combined · R-12
1,091 students · ICSEA 1081
Cabra Dominican College
Cumberland Park · Catholic combined · 7-12
1,165 students · ICSEA 1065
Rostrevor College
Woodforde · Catholic combined · R-12
985 students · ICSEA 1064
Frequently asked questions
Is St Mary's College a public or private school?
St Mary's College is a Catholic school, which makes it a non-government (private) school affiliated with Catholic Education South Australia.
What year levels does St Mary's College offer?
St Mary's College offers R to 12. It is classified by ACARA as a combined school.
How many students attend St Mary's College?
In 2025, St Mary's College had 659 enrolled students (659 girls, 0 boys), a change of -22% over five years.
What is the ICSEA of St Mary's College?
St Mary's College has an ICSEA (Index of Community Socio-Educational Advantage) of 1073. The national average is 1000, so this indicates above-average socio-educational advantage. ICSEA reflects the school community, not teaching quality.
How does St Mary's College rank in SA?
St Mary's College ranks 39th of 145 combined schools in South Australia on the Success Index (56.4/100), and 524th of 1,259 nationally.
What is the student-to-teacher ratio at St Mary's College?
St Mary's College has about 10.8 students per full-time-equivalent teacher, based on 2025 ACARA staffing data.
How big is the Year 7 cohort at St Mary's College?
In 2025, St Mary's College had 79 students in Year 7 and 100 in Year 12.
Is St Mary's College co-ed?
No. St Mary's College is a girls' school.
What other schools are near St Mary's College?
There are 10 other schools within 15 km of St Mary's College 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 College?
The closest Success Tutoring centre is Success Tutoring Windsor Gardens, about 9.0 km from the school. Success Tutoring offers a free academic assessment to identify your child's strengths and learning gaps before any sessions begin.