| Statistic | Robert-Cauchon | Salaberry-de-Valleyfield | Quebec |
| Population | 4,931 | 42,121 | 8,565,732 |
| Population density (sq km) | 2,418 | 383 | 6 |
| Median age | 49.8 | 48.3 | 42.6 |
| Male/Female ratio | 1.0:1 | 1.1:1 | 1.0:1 |
| Married couples | 35% | 44% | 50% |
| Families w/ kids at home | 24% | 34% | 40% |
| Speak English only | 0.3% | 0.4% | 4.7% |
| Speak French only | 65.2% | 63.0% | 49.5% |
| Data | Percent |
| Arab | 0.8% |
| Southeast Asian | 0.5% |
| Black | 0.3% |
| Latin American | 0.3% |
| Japanese | 0.1% |
| Data | Percent |
| Morocco | 0.5% |
| United States | 0.4% |
| France | 0.3% |
| Philippines | 0.3% |
| Other Central America | 0.2% |