St Mary's Cathedral College
Updated Oct 2026 · ACARA 2025Sydney, New South Wales 2000 · Sydney LGA
#63 of 314 combined schools in NSW
#182 of 1,259 nationally
About St Mary's Cathedral College
St Mary's Cathedral College is a catholic combined (K–12) school located in Sydney, New South Wales (2000), within the Sydney local government area. It caters for students from K to 12 and in 2025 enrolled 937 students (127 girls and 810 boys). The school is affiliated with Catholic Schools NSW.
St Mary's Cathedral College has an ICSEA value of 1125, indicating very high socio-educational advantage. That places it in the 90th percentile of Australian schools. 49% of students come from the top socio-educational quarter and 4% from the bottom quarter.
The school employs 75 teachers (72.3 full-time equivalent) and 24 non-teaching staff, giving a student-to-teacher ratio of about 13.0 to 1. Enrolments have grown by 18% over the past five years.
On the Success Index, St Mary's Cathedral College scores 74.9 out of 100, placing it in the top 25% of combined schools nationally and 63rd of 314 combined schools in NSW (5th of 6 in the Sydney area).
Success Index breakdown
Each component is a percentile against schools of the same type across Australia.
- Socio-educational advantage (ICSEA) (50%)ICSEA 1125
- Students in the top advantage quarter (15%)49% of students
- Teacher resourcing (students per teacher) (15%)13.0 students per teacher
- Enrolment growth vs local area (5 years) (10%)+18% enrolments since 2020 (area median +5%)
- ICSEA trend (5 years) (10%)+24 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 Cathedral College's 937 students are spread across year levels in 2025.
Enrolment trend
How enrolments at St Mary's Cathedral College have changed over the past decade.
Free academic assessment
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Schools near St Mary's Cathedral College
Closest schools by straight-line distance, with their Success Index.
Sydney Grammar School
Darlinghurst · Independent combined · K-12
1,925 students · ICSEA 1274 · 415 m away
Plunkett Street Public School
Woolloomooloo · Government primary · P-6
73 students · ICSEA 968 · 578 m away
Sydney Distance Education High School
Woolloomooloo · Government high school · 7-12
615 students · ICSEA 1032 · 645 m away
SCEGGS Darlinghurst
Darlinghurst · Independent combined · K-12
936 students · ICSEA 1209 · 674 m away
Macquarie Grammar School
Sydney · Independent high school · 7-12
84 students · ICSEA 1027 · 803 m away
Australian International High School
Sydney · Independent high school
· ICSEA 1028 · 821 m away
St Andrew's Cathedral Gawura School
Sydney · Independent primary · K-6
38 students · ICSEA 817 · 826 m away
St Andrew's Cathedral School
Sydney · Independent combined · K-12
1,436 students · ICSEA 1189 · 833 m away
Conservatorium High School
Sydney · Government high school · 7-12
156 students · ICSEA 1194 · 876 m away
St Vincent's College
Potts Point · Independent high school · 7-12
755 students · ICSEA 1145 · 1.0 km away
Similar schools
Catholic combined schools in NSW with a comparable ICSEA.
St Francis Catholic College
Edmondson Park · Catholic combined · K-12
1,559 students · ICSEA 1088
Marist Catholic College North Shore
North Sydney · Catholic combined · K-12
1,609 students · ICSEA 1166
St Vincent's College Ashfield
Ashfield · Catholic combined · K-12
1,092 students · ICSEA 1043
MacKillop Catholic College
Woongarrah · Catholic combined · K-12
1,558 students · ICSEA 1042
Lumen Christi Catholic College
Pambula Beach · Catholic combined · K-12
692 students · ICSEA 1040
All Saints Catholic College
Liverpool · Catholic combined · K-12
2,138 students · ICSEA 1038
Frequently asked questions
Is St Mary's Cathedral College a public or private school?
St Mary's Cathedral College is a Catholic school, which makes it a non-government (private) school affiliated with Catholic Schools NSW.
What year levels does St Mary's Cathedral College offer?
St Mary's Cathedral College offers K to 12. It is classified by ACARA as a combined school.
How many students attend St Mary's Cathedral College?
In 2025, St Mary's Cathedral College had 937 enrolled students (127 girls, 810 boys), a change of 18% over five years.
What is the ICSEA of St Mary's Cathedral College?
St Mary's Cathedral College has an ICSEA (Index of Community Socio-Educational Advantage) of 1125. The national average is 1000, so this indicates very high socio-educational advantage. ICSEA reflects the school community, not teaching quality.
How does St Mary's Cathedral College rank in NSW?
St Mary's Cathedral College ranks 63rd of 314 combined schools in New South Wales on the Success Index (74.9/100), and 182nd of 1,259 nationally.
What is the student-to-teacher ratio at St Mary's Cathedral College?
St Mary's Cathedral College has about 13.0 students per full-time-equivalent teacher, based on 2025 ACARA staffing data.
How big is the Year 7 cohort at St Mary's Cathedral College?
In 2025, St Mary's Cathedral College had 155 students in Year 7 and 112 in Year 12.
Is St Mary's Cathedral College co-ed?
Yes. St Mary's Cathedral College is a co-educational school enrolling both girls and boys.
What other schools are near St Mary's Cathedral College?
There are 10 other schools within 15 km of St Mary's Cathedral 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 Cathedral College?
The closest Success Tutoring centre is Success Tutoring Lane Cove, about 7.8 km from the school. Success Tutoring offers a free academic assessment to identify your child's strengths and learning gaps before any sessions begin.