| Statistic | L'ouest de la Montagne | Westmount | Quebec |
| Population | 2,125 | 22,392 | 8,565,732 |
| Population density (sq km) | 4,078 | 5,264 | 6 |
| Median age | 43.9 | 46.8 | 42.6 |
| Male/Female ratio | 1.1:1 | 1.1:1 | 1.0:1 |
| Married couples | 83% | 74% | 50% |
| Families w/ kids at home | 59% | 45% | 40% |
| Speak English only | 15.0% | 19.8% | 4.7% |
| Speak French only | 1.8% | 2.6% | 49.5% |
| Data | Percent |
| Chinese | 5.3% |
| South Asian | 2.9% |
| Southeast Asian | 1.8% |
| Filipino | 1.3% |
| West Asian | 1.3% |
| Data | Percent |
| France | 2.7% |
| China | 2.6% |
| United States | 2.3% |
| United Kingdom | 1.7% |
| Vietnam | 1.3% |