| Statistic | Saint Louis | Québec | Quebec |
| Population | 16,592 | 548,244 | 8,565,732 |
| Population density (sq km) | 2,572 | 1,210 | 6 |
| Median age | 41.4 | 43.1 | 42.6 |
| Male/Female ratio | 1.1:1 | 1.0:1 | 1.0:1 |
| Married couples | 54% | 44% | 50% |
| Families w/ kids at home | 36% | 36% | 40% |
| Speak English only | 0.4% | 0.3% | 4.7% |
| Speak French only | 45.0% | 58.9% | 49.5% |
| Data | Percent |
| Black | 7.9% |
| Latin American | 4.1% |
| Arab | 3.9% |
| Chinese | 1.0% |
| Southeast Asian | 0.7% |
| Data | Percent |
| Colombia | 2.0% |
| France | 1.4% |
| Morocco | 1.2% |
| Cameroon | 1.2% |
| Tunisia | 0.9% |