St Mary's School vs Williamstown Primary School
A head-to-head comparison of two primary schools in Victoria, 114 m apart, using official ACARA 2025 data. Best value in each row is highlighted.
St Mary's School
Williamstown · Catholic primary · Prep-6
263 students · ICSEA 1107
Williamstown Primary School
Williamstown · Government primary · Prep-6
460 students · ICSEA 1123
| Measure | St Mary's School Williamstown VIC | Williamstown Primary School Williamstown VIC |
|---|---|---|
| Success Index | 66 Top 25% | 69 Top 25% |
| State rank (type) | #507 of 1,290 | #429 of 1,290 |
| National rank (type) | #1398 of 4,908 | #1081 of 4,908 |
| Sector | Catholic | Government |
| Type | Primary | Primary |
| Year range | Prep-6 | Prep-6 |
| Students | 263 | 460 |
| Girls / boys | 131 / 132 | 212 / 248 |
| Foundation intake | 41 | 43 |
| Year 7 cohort | – | – |
| Year 12 cohort | – | – |
| VCE median study score VCAA, latest year | – | – |
| VCE study scores 40+ | – | – |
| 5-year enrolment growth | -22% | -13% |
| ICSEA Average 1000 | 1107 | 1123 |
| ICSEA percentile | 86th | 90th |
| Top SEA quarter | 40% | 52% |
| Bottom SEA quarter | 3% | 7% |
| Students per teacher | 14.5 | 15.5 |
| Teaching staff (FTE) | 18.2 | 29.6 |
| Non-teaching staff (FTE) | 7.2 | 7.6 |
| Language background other than English | 8% | 21% |
| Indigenous students | 0% | 2% |
| Suburb | Williamstown 3016 | Williamstown 3016 |
| Council area | Hobsons Bay | Hobsons Bay |
| Remoteness | Major Cities | Major Cities |
| Website | www.smwilliamstown.catholic.edu.au | www.williamstownps.vic.edu.au |
The verdict
- •Williamstown Primary School scores higher on the Success Index (69.3 vs 65.8).
- •Williamstown Primary School has the higher ICSEA (1123 vs 1107), indicating a more advantaged community.
- •St Mary's School has fewer students per teacher (14.5 vs 15.5).
- •Williamstown Primary School is the larger school with 460 students compared with 263.
- •Williamstown Primary School has grown faster over five years (-13% vs -22%).
- •St Mary's School is a catholic school while Williamstown Primary School is a government school, so fees and enrolment rules differ.
The Success Index summarises community advantage, resourcing and momentum from ACARA data. It does not measure teaching quality, results or fit. Methodology.
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Frequently asked questions
Is St Mary's School better than Williamstown Primary School?
On the Success Index, Williamstown Primary School ranks higher (69.3 vs 65.8 out of 100). The index measures community advantage and momentum from ACARA data, not teaching quality, so visit both schools before deciding.
How far apart are St Mary's School and Williamstown Primary School?
About 114 m in a straight line, between Williamstown and Williamstown in Victoria.
Which has the better student-to-teacher ratio?
St Mary's School has 14.5 students per full-time-equivalent teacher and Williamstown Primary School has 15.5.
How do St Mary's School and Williamstown Primary School rank in VIC?
St Mary's School is 507th of 1,290 and Williamstown Primary School is 429th of 1,290 among primary schools in Victoria on the 2025 Success Index.