| Statistic | Downtown St. Catharines | St. Catharines | Ontario |
| Population | 3,518 | 140,913 | 14,804,681 |
| Population density (sq km) | 2,871 | 1,410 | 15 |
| Median age | 37.3 | 44.4 | 40.9 |
| Male/Female ratio | 1.0:1 | 1.1:1 | 1.0:1 |
| Married couples | 49% | 66% | 71% |
| Families w/ kids at home | 19% | 38% | 46% |
| Speak English only | 88.9% | 91.9% | 86.1% |
| Speak French only | 0.2% | 0.1% | 0.3% |
| Data | Percent |
| Arab | 3.8% |
| Black | 3.6% |
| Chinese | 3.4% |
| Latin American | 2.6% |
| South Asian | 1.7% |
| Data | Percent |
| United Kingdom | 2.5% |
| South Korea | 1.1% |
| Other Northern Africa | 0.8% |
| India | 0.7% |
| Other West Central Asia And Middle East | 0.7% |