St Marys Senior High School
Updated Oct 2026 · ACARA 2025St Marys, New South Wales 2760 · Penrith LGA
About St Marys Senior High School
St Marys Senior High School is a public high school located in St Marys, New South Wales (2760), within the Penrith local government area. It caters for students from 11 to 12 and in 2025 enrolled 926 students (564 girls and 362 boys).
St Marys Senior High School has an ICSEA value of 1052, indicating above-average socio-educational advantage. That places it in the 69th percentile of Australian schools. 22% of students come from the top socio-educational quarter and 17% from the bottom quarter.
The school employs 66 teachers (67.6 full-time equivalent) and 15 non-teaching staff, giving a student-to-teacher ratio of about 13.7 to 1. Enrolments have remained steady over the past five years.
On the Success Index, St Marys Senior High School scores 62.1 out of 100, placing it in the top 50% of secondary schools nationally and 184th of 539 secondary schools in NSW (3rd of 17 in the Penrith area).
Success Index breakdown
Each component is a percentile against schools of the same type across Australia.
- Socio-educational advantage (ICSEA) (50%)ICSEA 1052
- Students in the top advantage quarter (15%)22% of students
- Teacher resourcing (students per teacher) (15%)13.7 students per teacher
- Enrolment growth vs local area (5 years) (10%)+2% enrolments since 2020 (area median +2%)
- ICSEA trend (5 years) (10%)+6 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 Marys Senior High School's 926 students are spread across year levels in 2025.
Enrolment trend
How enrolments at St Marys Senior High School have changed over the past decade.
Free academic assessment
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Schools near St Marys Senior High School
Closest schools by straight-line distance, with their Success Index.
St Marys Public School
St Marys · Government primary · P-6
258 students · ICSEA 954 · 586 m away
St Mary's Flexible School
St Marys · Independent special · 7-10
80 students · ICSEA 832 · 591 m away
Kurrambee School
Werrington · Government special · U
104 students · ICSEA 946 · 1.1 km away
Penrith Valley School
Werrington · Government special · U
39 students · ICSEA 873 · 1.1 km away
Our Lady of The Rosary Primary School
St Marys · Catholic primary · K-6
368 students · ICSEA 1032 · 1.2 km away
Wollemi College
Werrington · Independent combined · 2-12
565 students · ICSEA 1107 · 1.3 km away
St Marys North Public School
North St Marys · Government primary · K-6
345 students · ICSEA 873 · 1.4 km away
Putland School
Werrington · Government special · U
65 students · ICSEA 871 · 1.8 km away
Chifley College Dunheved Campus
North St Marys · Government high school · 7-10
586 students · ICSEA 870 · 1.9 km away
St Marys South Public School
St Marys · Government primary · K-6
319 students · ICSEA 945 · 2.0 km away
Similar schools
Government secondary schools in NSW with a comparable ICSEA.
Marrickville High School
Marrickville · Government high school · 7-12
625 students · ICSEA 1052
Engadine High School
Engadine · Government high school · 7-12
1,063 students · ICSEA 1051
The Jannali High School
Jannali · Government high school · 7-12
925 students · ICSEA 1051
Blacktown Boys High School
Blacktown · Government high school · 7-12
898 students · ICSEA 1053
Port Hacking High School
Miranda · Government high school · 7-12
950 students · ICSEA 1050
Cronulla High School
Cronulla · Government high school · 7-12
1,205 students · ICSEA 1050
Frequently asked questions
Is St Marys Senior High School a public or private school?
St Marys Senior High School is a public (government) school run by the New South Wales education department.
What year levels does St Marys Senior High School offer?
St Marys Senior High School offers 11 to 12. It is classified by ACARA as a secondary school.
How many students attend St Marys Senior High School?
In 2025, St Marys Senior High School had 926 enrolled students (564 girls, 362 boys), a change of 2% over five years.
What is the ICSEA of St Marys Senior High School?
St Marys Senior High School has an ICSEA (Index of Community Socio-Educational Advantage) of 1052. The national average is 1000, so this indicates above-average socio-educational advantage. ICSEA reflects the school community, not teaching quality.
How does St Marys Senior High School rank in NSW?
St Marys Senior High School ranks 184th of 539 secondary schools in New South Wales on the Success Index (62.1/100), and 463rd of 1,472 nationally.
What is the student-to-teacher ratio at St Marys Senior High School?
St Marys Senior High School has about 13.7 students per full-time-equivalent teacher, based on 2025 ACARA staffing data.
Is St Marys Senior High School co-ed?
Yes. St Marys Senior High School is a co-educational school enrolling both girls and boys.
What other schools are near St Marys Senior High School?
There are 10 other schools within 15 km of St Marys Senior High 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 Marys Senior High School?
The closest Success Tutoring centre is Success Tutoring Mount Druitt, about 4.7 km from the school. Success Tutoring offers a free academic assessment to identify your child's strengths and learning gaps before any sessions begin.