| 30 | Pickering College | Newmarket | Site based only | Conference of Independent Schools of Ontario | Visit |
| 367 | Endless PossABILITIES | Newmarket | Site based only | No Association Membership | Visit |
| 446 | Innova Academy | Newmarket | Site based only | Other | Visit |
| 447 | Innova Academy Upper School | Newmarket | Site based only | Other | Visit |
| 459 | International Academy | Newmarket | Online Only | No Association Membership | — |
| 586 | New Beginnings Christian Learning Academy | Newmarket | Site based only | Other | Visit |
| 697 | Royal Canadian High School | Newmarket | Online Only | No Association Membership | Visit |