| Statistic | Castle Gardens | Longueuil | Quebec |
| Population | 3,643 | 249,920 | 8,565,732 |
| Population density (sq km) | 3,670 | 2,158 | 6 |
| Median age | 43.5 | 41.7 | 42.6 |
| Male/Female ratio | 1.0:1 | 1.0:1 | 1.0:1 |
| Married couples | 54% | 49% | 50% |
| Families w/ kids at home | 40% | 39% | 40% |
| Speak English only | 3.4% | 2.7% | 4.7% |
| Speak French only | 52.3% | 46.6% | 49.5% |
| Data | Percent |
| Black | 9.3% |
| Arab | 4.4% |
| Latin American | 3.3% |
| West Asian | 1.5% |
| South Asian | 1.3% |
| Data | Percent |
| Haiti | 2.4% |
| Morocco | 1.8% |
| Romania | 1.2% |
| Algeria | 0.9% |
| China | 0.7% |