| Statistic | Quartier Vieux Longueuil | Longueuil | Quebec |
| Population | 14,705 | 249,920 | 8,565,732 |
| Population density (sq km) | 3,836 | 2,158 | 6 |
| Median age | 47.0 | 41.7 | 42.6 |
| Male/Female ratio | 1.1:1 | 1.0:1 | 1.0:1 |
| Married couples | 41% | 49% | 50% |
| Families w/ kids at home | 30% | 39% | 40% |
| Speak English only | 1.4% | 2.7% | 4.7% |
| Speak French only | 40.6% | 46.6% | 49.5% |
| Data | Percent |
| Black | 5.2% |
| Latin American | 3.0% |
| Arab | 2.7% |
| West Asian | 1.5% |
| Southeast Asian | 0.8% |
| Data | Percent |
| France | 2.4% |
| Afghanistan | 1.0% |
| Morocco | 0.9% |
| Algeria | 0.8% |
| Colombia | 0.7% |
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