| Statistic | Île Sainte-Thérèse | Saint-Jean-sur-Richelieu | Quebec |
| Population | 3,839 | 99,027 | 8,565,732 |
| Population density (sq km) | 1,447 | 430 | 6 |
| Median age | 42.0 | 43.2 | 42.6 |
| Male/Female ratio | 1.0:1 | 1.0:1 | 1.0:1 |
| Married couples | 46% | 43% | 50% |
| Families w/ kids at home | 46% | 40% | 40% |
| Speak English only | 0.7% | 0.5% | 4.7% |
| Speak French only | 52.3% | 57.8% | 49.5% |
| Data | Percent |
| N/A | 0.0% |
| Data | Percent |
| Romania | 0.5% |
| France | 0.5% |
| Peru | 0.4% |
| Russia | 0.4% |
| Haiti | 0.2% |