Ontario Secondary School Enrolment by Grade and Board

Student enrolment counts for Ontario secondary schools are aggregated by grade and school board. Data originates from the Ontario School Information System (OnSIS) October submissions and is published by the Government of Ontario. The dataset covers public and Catholic school systems, with records updated as of February 2026.

Use Cases

• Analyze grade 9 to grade 12 enrolment trends across different school boards to forecast future resource needs.
• Compare total enrolment figures between public and Catholic school authorities to understand market share.
• Model student population flows using board-level aggregated data for demographic research.
• Identify boards with suppressed enrolment counts (less than 10 students) to map data sparsity for privacy analysis.

Strengths

• Data is reported directly from schools via the authoritative Ontario School Information System (OnSIS).
• Includes explicit coverage of both public and Catholic secondary school types.
• Records are updated frequently, with a last update date in February 2026.

Limitations

• Enrolment numbers are rounded to the nearest five starting in the 2018-2019 school year, reducing precision.
• Counts in categories with fewer than 10 students are suppressed for privacy, creating data gaps.
• Rounded figures may not sum to reported rounded totals due to calculation methodology.

Provenance

Source

Ontario School Information System (OnSIS).

Collection Method

Aggregated from mandatory October submissions by schools.

Time Range

Includes data from at least the 2018-2019 school year onward.

Freshness

Updated February 2026.

Geography

Province of Ontario, Canada.