| Statistic | La Montagne de Westmount | Westmount | Quebec |
| Population | 502 | 22,392 | 8,565,732 |
| Population density (sq km) | 1,048 | 5,264 | 6 |
| Median age | 46.9 | 46.8 | 42.6 |
| Male/Female ratio | 0.9:1 | 1.1:1 | 1.0:1 |
| Married couples | 83% | 74% | 50% |
| Families w/ kids at home | 52% | 45% | 40% |
| Speak English only | 15.1% | 19.8% | 4.7% |
| Speak French only | 2.0% | 2.6% | 49.5% |
| Data | Percent |
| Southeast Asian | 10.1% |
| Chinese | 9.7% |
| West Asian | 2.8% |
| Arab | 1.8% |
| Latin American | 1.6% |
| Data | Percent |
| China | 5.9% |
| Iran | 3.6% |
| Morocco | 2.6% |
| Poland | 2.4% |
| France | 2.0% |