| Statistic | St-Gregoire | Bécancour | Quebec |
| Population | 5,541 | 13,552 | 8,565,732 |
| Population density (sq km) | 53 | 31 | 6 |
| Median age | 43.5 | 43.9 | 42.6 |
| Male/Female ratio | 1.0:1 | 1.0:1 | 1.0:1 |
| Married couples | 42% | 43% | 50% |
| Families w/ kids at home | 41% | 39% | 40% |
| Speak English only | 0.0% | 0.1% | 4.7% |
| Speak French only | 67.1% | 72.5% | 49.5% |
| Data | Percent |
| Black | 0.3% |
| All Other Visible Minorities | 0.2% |
| Southeast Asian | 0.1% |
| Japanese | 0.1% |
| Latin American | 0.1% |
| Data | Percent |
| France | 0.3% |
| Morocco | 0.2% |
| China | 0.2% |
| Japan | 0.2% |
| Other Central Africa | 0.1% |