| Statistic | Duncan | British Columbia | National |
| Population | 5,315 | 5,149,422 | 38,134,230 |
| Population density (sq km) | 2,535 | 5 | 4 |
| Median age | 53.9 | 42.3 | 40.9 |
| Male/Female ratio | 1.2:1 | 1.0:1 | 1.0:1 |
| Married couples | 55% | 71% | 66% |
| Families w/ kids at home | 27% | 41% | 43% |
| Speak English only | 93.5% | 89.7% | 68.8% |
| Speak French only | 0.0% | 0.0% | 4.5% |
| Data | Percent |
| South Asian | 1.4% |
| Black | 1.4% |
| Chinese | 0.6% |
| All Other Visible Minorities | 0.5% |
| Filipino | 0.5% |
| Data | Percent |
| United Kingdom | 3.9% |
| United States | 2.1% |
| Netherlands | 1.3% |
| India | 1.1% |
| Germany | 0.5% |