| Dates | School | Confirmed Cases |
|---|
| Collected | Reported | School Board | School | Municipality | Student | Staff | Unspecified | Total |
|---|
| 2021-03-22 | 2021-03-23 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 2 | 1 | 0 | 3 |
| 2021-03-19 | 2021-03-22 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 2 | 1 | 0 | 3 |
| 2021-03-18 | 2021-03-19 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 2 | 1 | 0 | 3 |
| 2021-03-17 | 2021-03-18 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 2 | 1 | 0 | 3 |
| 2021-03-16 | 2021-03-17 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 2 | 1 | 0 | 3 |
| 2021-03-15 | 2021-03-16 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 2 | 1 | 0 | 3 |
| 2021-03-12 | 2021-03-15 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 2 | 1 | 0 | 3 |
| 2021-03-11 | 2021-03-12 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 2 | 1 | 0 | 3 |
| 2021-03-10 | 2021-03-11 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 2 | 1 | 0 | 3 |
| 2021-03-09 | 2021-03-10 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 2 | 1 | 0 | 3 |
| 2021-03-08 | 2021-03-09 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 0 | 1 | 0 | 1 |
| 2020-11-25 | 2020-11-26 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 0 | 0 | 2 | 2 |
| 2020-11-24 | 2020-11-25 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 0 | 0 | 2 | 2 |
| 2020-11-16 | 2020-11-17 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 0 | 0 | 2 | 2 |
| 2020-11-13 | 2020-11-16 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 0 | 0 | 2 | 2 |
| 2020-11-12 | 2020-11-13 | York Catholic District School Board | St. Mary Catholic Elementary School | King | 0 | 0 | 2 | 2 |
| 2021-04-14 | 2021-04-15 | Niagara Catholic District School Board | St. Mary Catholic Elementary School | Niagara Falls | 1 | 0 | 0 | 1 |
| 2021-04-09 | 2021-04-12 | Niagara Catholic District School Board | St. Mary Catholic Elementary School | Niagara Falls | 1 | 0 | 0 | 1 |
| 2021-04-08 | 2021-04-09 | Niagara Catholic District School Board | St. Mary Catholic Elementary School | Niagara Falls | 1 | 0 | 0 | 1 |
| 2020-11-16 | 2020-11-17 | Niagara Catholic District School Board | St. Mary Catholic Elementary School | Niagara Falls | 2 | 0 | 0 | 2 |
| 2020-11-13 | 2020-11-16 | Niagara Catholic District School Board | St. Mary Catholic Elementary School | Niagara Falls | 2 | 0 | 0 | 2 |
| 2020-11-12 | 2020-11-13 | Niagara Catholic District School Board | St. Mary Catholic Elementary School | Niagara Falls | 2 | 0 | 0 | 2 |
| 2020-11-11 | 2020-11-12 | Niagara Catholic District School Board | St. Mary Catholic Elementary School | Niagara Falls | 2 | 0 | 0 | 2 |
| 2020-11-10 | 2020-11-11 | Niagara Catholic District School Board | St. Mary Catholic Elementary School | Niagara Falls | 2 | 0 | 0 | 2 |
| 2020-11-09 | 2020-11-10 | Niagara Catholic District School Board | St. Mary Catholic Elementary School | Niagara Falls | 2 | 0 | 0 | 2 |
| 2021-03-04 | 2021-03-05 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2021-03-03 | 2021-03-04 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2021-03-02 | 2021-03-03 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2021-03-01 | 2021-03-02 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2021-02-26 | 2021-03-01 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2021-02-25 | 2021-02-26 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2021-02-24 | 2021-02-25 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2021-02-23 | 2021-02-24 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2021-02-22 | 2021-02-23 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2021-02-19 | 2021-02-22 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2020-12-02 | 2020-12-03 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2020-12-01 | 2020-12-02 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2020-11-30 | 2020-12-01 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2020-11-27 | 2020-11-30 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2020-11-26 | 2020-11-27 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2020-11-25 | 2020-11-26 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2020-11-24 | 2020-11-25 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2020-11-23 | 2020-11-24 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2020-11-20 | 2020-11-23 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2020-11-19 | 2020-11-20 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 1 | 0 | 0 | 1 |
| 2020-11-06 | 2020-11-09 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 0 | 0 | 1 | 1 |
| 2020-11-05 | 2020-11-06 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 0 | 0 | 1 | 1 |
| 2020-11-04 | 2020-11-05 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 0 | 0 | 1 | 1 |
| 2020-11-03 | 2020-11-04 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 0 | 0 | 1 | 1 |
| 2020-11-02 | 2020-11-03 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 0 | 0 | 1 | 1 |
| 2020-10-30 | 2020-11-02 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 0 | 0 | 1 | 1 |
| 2020-10-29 | 2020-10-30 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 0 | 0 | 1 | 1 |
| 2020-10-28 | 2020-10-29 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 0 | 0 | 1 | 1 |
| 2020-10-27 | 2020-10-28 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 0 | 0 | 1 | 1 |
| 2020-10-26 | 2020-10-27 | Halton Catholic District School Board | St. Mary Catholic Elementary School | Oakville | 0 | 0 | 1 | 1 |