| Index | Duncan | British Columbia | National |
| Average School Score | 60.7 | 62.9 | 66.1 |
| Total public schools | 22 | 2,286 | 17,366 |
| Index | Duncan | British Columbia | National |
| No certificate, diploma or degree | 21.0% | 14.1% | 16.7% |
| High School certificate or equivalent | 79.3% | 85.9% | 83.3% |
| Apprenticeship or trades certificate | 48.6% | 56.6% | 56.8% |
| College or other non-university diploma | 39.8% | 48.1% | 47.4% |
| University certificate or below bachelor | 17.2% | 29.4% | 27.5% |
| Bachelor's degree | 13.5% | 26.4% | 25.1% |
| Above bachelor's degree | 5.4% | 8.9% | 8.1% |
| City | Population | Avg. School Score | National Avg. |
| Cowichan Valley C, BC | 5,466 | 64.0 | 3.3% |
| Cowichan Valley D, BC | 3,569 | 63.3 | 4.3% |
| Saltspring Island, BC | 11,001 | 63.1 | 4.6% |
| North Saanich, BC | 11,587 | 62.9 | 4.9% |
| North Cowichan, BC | 32,420 | 62.6 | 5.3% |
| Duncan, BC | 5,315 | 60.7 | 8.2% |
| City | Population | Avg. School Score | National Avg. |
| West Elgin, ON | 5,284 | 47.8 | 27.7% |
| Stettler County No. 6, AB | 5,275 | 63.4 | 4.1% |
| Cochrane, ON | 5,372 | 52.8 | 20.2% |
| Cowichan Valley A, BC | 5,392 | 57.3 | 13.3% |
| Big Lakes County, AB | 5,434 | 45.7 | 31.0% |
| Duncan, BC | 5,315 | 60.7 | 8.2% |