| Statistic | Merwin Heights | London | Ontario |
| Population | 2,574 | 421,456 | 14,804,681 |
| Population density (sq km) | 2,726 | 984 | 15 |
| Median age | 38.7 | 39.1 | 40.9 |
| Male/Female ratio | 0.9:1 | 1.1:1 | 1.0:1 |
| Married couples | 55% | 67% | 71% |
| Families w/ kids at home | 33% | 41% | 46% |
| Speak English only | 93.7% | 90.9% | 86.1% |
| Speak French only | 0.3% | 0.1% | 0.3% |
| Data | Percent |
| Black | 4.5% |
| South Asian | 3.1% |
| Latin American | 1.8% |
| Southeast Asian | 1.7% |
| Multiple Visible Minorities | 1.5% |
| Data | Percent |
| Portugal | 2.4% |
| United Kingdom | 1.5% |
| Poland | 1.2% |
| Syria | 1.1% |
| Philippines | 1.0% |