St Mary's College
Updated Oct 2026 · ACARA 2025Gunnedah, New South Wales 2380 · Gunnedah LGA
#289 of 539 high schools in NSW
#780 of 1,472 nationally
About St Mary's College
St Mary's College is a catholic high school located in Gunnedah, New South Wales (2380), within the Gunnedah local government area. It caters for students from 7 to 12 and in 2025 enrolled 411 students (221 girls and 190 boys). The school is affiliated with Catholic Schools NSW.
St Mary's College has an ICSEA value of 976, indicating a socio-educational profile close to the national average of 1000. That places it in the 36th percentile of Australian schools. 10% of students come from the top socio-educational quarter and 34% from the bottom quarter.
The school employs 44 teachers (38.6 full-time equivalent) and 25 non-teaching staff, giving a student-to-teacher ratio of about 10.6 to 1. Enrolments have grown by 11% over the past five years.
On the Success Index, St Mary's College scores 47.8 out of 100, placing it in the lower 50% of secondary schools nationally and 289th of 539 secondary schools in NSW (1st of 2 in the Gunnedah area).
Success Index breakdown
Each component is a percentile against schools of the same type across Australia.
- Socio-educational advantage (ICSEA) (50%)ICSEA 976
- Students in the top advantage quarter (15%)10% of students
- Teacher resourcing (students per teacher) (15%)10.6 students per teacher
- Enrolment growth vs local area (5 years) (10%)+11% enrolments since 2020
- ICSEA trend (5 years) (10%)-11 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 411 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
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Schools near St Mary's College
Closest schools by straight-line distance, with their Success Index.
St Xavier's Primary School
Gunnedah · Catholic primary · K-6
366 students · ICSEA 996 · 357 m away
Gunnedah Public School
Gunnedah · Government primary · K-6
175 students · ICSEA 785 · 440 m away
Carinya Christian School Gunnedah
Gunnedah · Independent combined · K-10
231 students · ICSEA 965 · 514 m away
Gunnedah High School
Gunnedah · Government high school · 7-12
438 students · ICSEA 820 · 1.1 km away
Gunnedah South Public School
Gunnedah · Government primary · K-6
533 students · ICSEA 902 · 1.6 km away
G S Kidd Memorial School
Gunnedah · Government special · U
35 students · ICSEA 881 · 2.7 km away
Similar schools
Catholic secondary schools in NSW with a comparable ICSEA.
La Salle Academy Lithgow
Lithgow · Catholic high school · 7-12
230 students · ICSEA 980
Patrician Brothers' College Fairfield
Fairfield · Catholic high school · 7-12
1,144 students · ICSEA 969
St Joseph's Catholic College
Aberdeen · Catholic high school · 7-12
685 students · ICSEA 968
St Mary's Catholic College
Casino · Catholic high school · 7-12
425 students · ICSEA 985
Carroll College
Broulee · Catholic high school · 7-12
493 students · ICSEA 987
St Clare's Catholic High School
Hassall Grove · Catholic high school · 7-12
618 students · ICSEA 963
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 Schools NSW.
What year levels does St Mary's College offer?
St Mary's College offers 7 to 12. It is classified by ACARA as a secondary school.
How many students attend St Mary's College?
In 2025, St Mary's College had 411 enrolled students (221 girls, 190 boys), a change of 11% 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 976. 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 College rank in NSW?
St Mary's College ranks 289th of 539 secondary schools in New South Wales on the Success Index (47.8/100), and 780th of 1,472 nationally.
What is the student-to-teacher ratio at St Mary's College?
St Mary's College has about 10.6 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 91 students in Year 7 and 40 in Year 12.
Is St Mary's College co-ed?
Yes. St Mary's College is a co-educational school enrolling both girls and boys.
What other schools are near St Mary's College?
There are 6 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 Belmont, about 263 km from the school. Success Tutoring offers a free academic assessment to identify your child's strengths and learning gaps before any sessions begin.