Trinity College Senior
Updated Oct 2026 · ACARA 2025Evanston South, South Australia 5116 · Gawler LGA
About Trinity College Senior
Trinity College Senior is an independent high school located in Evanston South, South Australia (5116), within the Gawler local government area. It caters for students from 11 to 12 and in 2025 enrolled 669 students (339 girls and 330 boys). The school is affiliated with Association of Independent Schools of SA.
Trinity College Senior 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. 13% of students come from the top socio-educational quarter and 24% from the bottom quarter.
The school employs 68 teachers (58.8 full-time equivalent) and 90 non-teaching staff, giving a student-to-teacher ratio of about 11.4 to 1. Enrolments have grown by 18% over the past five years.
On the Success Index, Trinity College Senior scores 58.9 out of 100, placing it in the top 50% of secondary schools nationally and 26th of 84 secondary schools in SA.
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%)13% of students
- Teacher resourcing (students per teacher) (15%)11.4 students per teacher
- Enrolment growth vs local area (5 years) (10%)+18% enrolments since 2020
- ICSEA trend (5 years) (10%)-13 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 Trinity College Senior's 669 students are spread across year levels in 2025.
Enrolment trend
How enrolments at Trinity College Senior have changed over the past decade.
Free academic assessment
Is your child on track at Trinity College Senior?
Rankings tell you about a school community. A free Success Tutoring assessment tells you about your child: exactly where they are in English and Maths, where the gaps are, and a plan to close them. Small-group, Australian-curriculum tutoring with no lock-in contracts.
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Schools near Trinity College Senior
Closest schools by straight-line distance, with their Success Index.
Trinity College North
Evanston South · Independent combined · R-10
914 students · ICSEA 1040 · 133 m away
Trinity College South
Evanston South · Independent combined · R-10
957 students · ICSEA 1039 · 323 m away
Gawler and District College B-12
Evanston · Government combined · U, R-12
1,247 students · ICSEA 932 · 1.5 km away
Evanston Gardens Primary School
Evanston Gardens · Government primary · R-6
263 students · ICSEA 943 · 1.7 km away
Gawler Primary School
Gawler · Government primary · R-6
168 students · ICSEA 954 · 4.0 km away
Immanuel Gawler
Gawler East · Independent primary · R-6
353 students · ICSEA 1038 · 4.4 km away
Gawler East Primary School
Gawler East · Government primary · R-6
374 students · ICSEA 987 · 4.6 km away
Munno Para Primary School
Munno Para · Government primary · U, R-6
305 students · ICSEA 929 · 5.1 km away
Adelaide North Special School
Munno Para West · Government special · U
178 students · ICSEA 964 · 5.7 km away
Mark Oliphant College (B-12)
Munno Para West · Government combined · U, R-12
1,685 students · ICSEA 919 · 5.9 km away
Similar schools
Independent secondary schools in SA with a comparable ICSEA.
Specialised Assistance School For Youth (SASY)
Adelaide · Independent high school · 8-12
205 students · ICSEA 1026
Prescott College
Prospect · Independent high school · 7-12
206 students · ICSEA 1016
Sports College South Australia
Gepps Cross · Independent high school · 11-12
404 students · ICSEA 1015
Temple Christian College
Mile End · Independent high school · 7-12
1,151 students · ICSEA 1043
Muirden Senior College
Adelaide · Independent high school · 11-12
91 students · ICSEA 1079
Endeavour College
Mawson Lakes · Independent high school · 7-12
738 students · ICSEA 1083
Frequently asked questions
Is Trinity College Senior a public or private school?
Trinity College Senior is a Independent school, which makes it a non-government (private) school affiliated with Association of Independent Schools of SA.
What year levels does Trinity College Senior offer?
Trinity College Senior offers 11 to 12. It is classified by ACARA as a secondary school.
How many students attend Trinity College Senior?
In 2025, Trinity College Senior had 669 enrolled students (339 girls, 330 boys), a change of 18% over five years.
What is the ICSEA of Trinity College Senior?
Trinity College Senior 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 Trinity College Senior rank in SA?
Trinity College Senior ranks 26th of 84 secondary schools in South Australia on the Success Index (58.9/100), and 544th of 1,472 nationally.
What is the student-to-teacher ratio at Trinity College Senior?
Trinity College Senior has about 11.4 students per full-time-equivalent teacher, based on 2025 ACARA staffing data.
Is Trinity College Senior co-ed?
Yes. Trinity College Senior is a co-educational school enrolling both girls and boys.
What other schools are near Trinity College Senior?
There are 10 other schools within 15 km of Trinity College Senior 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 Trinity College Senior?
The closest Success Tutoring centre is Success Tutoring Windsor Gardens, about 27 km from the school. Success Tutoring offers a free academic assessment to identify your child's strengths and learning gaps before any sessions begin.