| Statistic | Cornwall Island | Cornwall | Ontario |
| Population | 1,474 | 47,736 | 14,804,681 |
| Population density (sq km) | 159 | 767 | 15 |
| Median age | 29.8 | 46.7 | 40.9 |
| Male/Female ratio | 1.3:1 | 1.1:1 | 1.0:1 |
| Married couples | 33% | 60% | 71% |
| Families w/ kids at home | 34% | 33% | 46% |
| Speak English only | 97.3% | 57.2% | 86.1% |
| Speak French only | 0.3% | 0.9% | 0.3% |
| Data | Percent |
| N/A | 0.0% |
| Data | Percent |
| United States | 1.9% |
| Philippines | 1.0% |
| Cameroon | 0.9% |
| Sri Lanka | 0.9% |
| China | 0.8% |