| Statistic | Westmount | Westmount | Quebec |
| Population | 22,155 | 22,392 | 8,565,732 |
| Population density (sq km) | 5,275 | 5,264 | 6 |
| Median age | 46.7 | 46.8 | 42.6 |
| Male/Female ratio | 1.1:1 | 1.1:1 | 1.0:1 |
| Married couples | 74% | 74% | 50% |
| Families w/ kids at home | 45% | 45% | 40% |
| Speak English only | 19.8% | 19.8% | 4.7% |
| Speak French only | 2.5% | 2.6% | 49.5% |
| Data | Percent |
| Chinese | 4.1% |
| Arab | 3.4% |
| Korean | 2.4% |
| Black | 2.3% |
| South Asian | 2.0% |
| Data | Percent |
| France | 2.3% |
| China | 2.1% |
| United States | 2.1% |
| United Kingdom | 1.9% |
| Iran | 1.4% |