| Statistic | Marsdale | St. Catharines | Ontario |
| Population | 1,956 | 140,913 | 14,804,681 |
| Population density (sq km) | 1,328 | 1,410 | 15 |
| Median age | 39.5 | 44.4 | 40.9 |
| Male/Female ratio | 1.0:1 | 1.1:1 | 1.0:1 |
| Married couples | 70% | 66% | 71% |
| Families w/ kids at home | 39% | 38% | 46% |
| Speak English only | 89.1% | 91.9% | 86.1% |
| Speak French only | 0.0% | 0.1% | 0.3% |
| Data | Percent |
| Chinese | 14.4% |
| Black | 5.1% |
| South Asian | 2.7% |
| Southeast Asian | 1.1% |
| Arab | 1.0% |
| Data | Percent |
| United Kingdom | 2.6% |
| China | 2.4% |
| United States | 2.3% |
| India | 1.7% |
| Other Western Europe | 1.1% |