| Statistic | Thorold | Ontario | National |
| Population | 21,396 | 14,804,681 | 38,134,230 |
| Population density (sq km) | 237 | 15 | 4 |
| Median age | 41.2 | 40.9 | 40.9 |
| Male/Female ratio | 1.0:1 | 1.0:1 | 1.0:1 |
| Married couples | 66% | 71% | 66% |
| Families w/ kids at home | 42% | 46% | 43% |
| Speak English only | 93.0% | 86.1% | 68.8% |
| Speak French only | 0.1% | 0.3% | 4.5% |
| Data | Percent |
| Black | 3.5% |
| South Asian | 2.4% |
| Chinese | 1.8% |
| Latin American | 1.1% |
| Multiple Visible Minorities | 0.9% |
| Data | Percent |
| Italy | 3.0% |
| United Kingdom | 1.9% |
| United States | 0.8% |
| India | 0.7% |
| South Korea | 0.4% |