Southern Montessori School
Updated Oct 2026 · ACARA 2025O'Sullivan Beach, South Australia 5166 · Onkaparinga LGA
#22 of 145 combined schools in SA
#372 of 1,259 nationally
About Southern Montessori School
Southern Montessori School is an independent combined (K–12) school located in O'Sullivan Beach, South Australia (5166), within the Onkaparinga local government area. It caters for students from R to 9 and in 2025 enrolled 230 students (122 girls and 108 boys). The school is affiliated with Association of Independent Schools of SA.
Southern Montessori School has an ICSEA value of 1095, indicating above-average socio-educational advantage. That places it in the 83rd percentile of Australian schools. 35% of students come from the top socio-educational quarter and 6% from the bottom quarter.
The school employs 28 teachers (18.4 full-time equivalent) and 19 non-teaching staff, giving a student-to-teacher ratio of about 12.5 to 1. Enrolments have grown by 17% over the past five years.
On the Success Index, Southern Montessori School scores 64.8 out of 100, placing it in the top 50% of combined schools nationally and 22nd of 145 combined schools in SA (1st of 9 in the Onkaparinga area).
Success Index breakdown
Each component is a percentile against schools of the same type across Australia.
- Socio-educational advantage (ICSEA) (50%)ICSEA 1095
- Students in the top advantage quarter (15%)35% of students
- Teacher resourcing (students per teacher) (15%)12.5 students per teacher
- Enrolment growth vs local area (5 years) (10%)+17% enrolments since 2020 (area median +11%)
- ICSEA trend (5 years) (10%)-4 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 Southern Montessori School's 230 students are spread across year levels in 2025.
Enrolment trend
How enrolments at Southern Montessori School have changed over the past decade.
Free academic assessment
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Schools near Southern Montessori School
Closest schools by straight-line distance, with their Success Index.
O'Sullivan Beach Primary School
O'Sullivan Beach · Government primary · R-6
84 students · ICSEA 926 · 69 m away
St John The Apostle Parish School
Christies Beach · Catholic primary · R-6
334 students · ICSEA 1021 · 480 m away
Christies Beach Primary School
Christies Beach · Government primary · U, R-6
194 students · ICSEA 889 · 1.4 km away
Christie Downs Primary School
Christie Downs · Government primary · U, R-6
205 students · ICSEA 925 · 1.6 km away
FAME - Flexible Accredited Meaningful Engagement
Christie Downs · Catholic special · 7-12
137 students · ICSEA 952 · 1.7 km away
Lonsdale Heights Primary School
Christie Downs · Government primary · U, R-6
71 students · ICSEA 949 · 2.1 km away
Port Noarlunga Primary School
Port Noarlunga · Government primary · R-6
370 students · ICSEA 999 · 2.1 km away
Christies Beach High School
Christie Downs · Government high school · U, 7-12
789 students · ICSEA 905 · 2.2 km away
Cardijn College
Noarlunga Downs · Catholic combined · R-12
2,247 students · ICSEA 1019 · 2.8 km away
Calvary Lutheran Primary School
Morphett Vale · Independent primary · R-6
191 students · ICSEA 971 · 3.2 km away
Similar schools
Independent combined schools in SA with a comparable ICSEA.
Pedare Christian College
Golden Grove · Independent combined · R-12
1,146 students · ICSEA 1097
The Hills Christian Community School
Verdun · Independent combined · R-12
640 students · ICSEA 1092
Sunrise Christian School Marion
Marion · Independent combined · R-9
320 students · ICSEA 1090
Cedar College
Northgate · Independent combined · R-12
884 students · ICSEA 1090
King's Baptist Grammar School
Wynn Vale · Independent combined · R-12
1,280 students · ICSEA 1090
Mount Barker Waldorf School
Mount Barker · Independent combined · R-12
321 students · ICSEA 1087
Frequently asked questions
Is Southern Montessori School a public or private school?
Southern Montessori School is a Independent school, which makes it a non-government (private) school affiliated with Association of Independent Schools of SA.
What year levels does Southern Montessori School offer?
Southern Montessori School offers R to 9. It is classified by ACARA as a combined school.
How many students attend Southern Montessori School?
In 2025, Southern Montessori School had 230 enrolled students (122 girls, 108 boys), a change of 17% over five years.
What is the ICSEA of Southern Montessori School?
Southern Montessori School has an ICSEA (Index of Community Socio-Educational Advantage) of 1095. The national average is 1000, so this indicates above-average socio-educational advantage. ICSEA reflects the school community, not teaching quality.
How does Southern Montessori School rank in SA?
Southern Montessori School ranks 22nd of 145 combined schools in South Australia on the Success Index (64.8/100), and 372nd of 1,259 nationally.
What is the student-to-teacher ratio at Southern Montessori School?
Southern Montessori School has about 12.5 students per full-time-equivalent teacher, based on 2025 ACARA staffing data.
How big is the Year 7 cohort at Southern Montessori School?
In 2025, Southern Montessori School had 23 students in Year 7.
Is Southern Montessori School co-ed?
Yes. Southern Montessori School is a co-educational school enrolling both girls and boys.
What other schools are near Southern Montessori School?
There are 10 other schools within 15 km of Southern Montessori 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 Southern Montessori School?
The closest Success Tutoring centre is Success Tutoring Windsor Gardens, about 33 km from the school. Success Tutoring offers a free academic assessment to identify your child's strengths and learning gaps before any sessions begin.