| Statistic | Les Vieilles-Forges | Trois-Rivières | Quebec |
| Population | 3,473 | 138,766 | 8,565,732 |
| Population density (sq km) | 104 | 478 | 6 |
| Median age | 44.7 | 46.6 | 42.6 |
| Male/Female ratio | 0.9:1 | 1.1:1 | 1.0:1 |
| Married couples | 46% | 43% | 50% |
| Families w/ kids at home | 38% | 34% | 40% |
| Speak English only | 0.0% | 0.2% | 4.7% |
| Speak French only | 68.7% | 68.3% | 49.5% |
| Data | Percent |
| Black | 2.0% |
| Arab | 1.4% |
| Latin American | 0.9% |
| South Asian | 0.2% |
| Multiple Visible Minorities | 0.0% |
| Data | Percent |
| Other South America | 1.0% |
| Colombia | 0.5% |
| Morocco | 0.3% |
| Mexico | 0.3% |
| Other Eastern Africa | 0.3% |