| Statistic | Westmount | London | Ontario |
| Population | 20,611 | 421,456 | 14,804,681 |
| Population density (sq km) | 2,507 | 984 | 15 |
| Median age | 44.6 | 39.1 | 40.9 |
| Male/Female ratio | 1.1:1 | 1.1:1 | 1.0:1 |
| Married couples | 75% | 67% | 71% |
| Families w/ kids at home | 43% | 41% | 46% |
| Speak English only | 89.7% | 90.9% | 86.1% |
| Speak French only | 0.0% | 0.1% | 0.3% |
| Data | Percent |
| Arab | 8.2% |
| South Asian | 5.2% |
| Latin American | 2.9% |
| Black | 2.1% |
| Chinese | 2.0% |
| Data | Percent |
| United Kingdom | 2.4% |
| Iraq | 2.3% |
| India | 1.5% |
| Colombia | 1.2% |
| Other West Central Asia And Middle East | 0.9% |