| Statistic | Rosemont | Adjala-Tosorontio | Ontario |
| Population | 377 | 12,021 | 14,804,681 |
| Population density (sq km) | 812 | 31 | 15 |
| Median age | 49.3 | 46.2 | 40.9 |
| Male/Female ratio | 1.2:1 | 0.9:1 | 1.0:1 |
| Married couples | 78% | 76% | 71% |
| Families w/ kids at home | 39% | 48% | 46% |
| Speak English only | 95.4% | 94.5% | 86.1% |
| Speak French only | 0.0% | 0.0% | 0.3% |
| Data | Percent |
| South Asian | 1.5% |
| Southeast Asian | 0.3% |
| N/A | 0.0% |
| Data | Percent |
| United Kingdom | 3.7% |
| Pakistan | 3.0% |
| Italy | 1.5% |
| Germany | 1.5% |
| India | 1.2% |