| Statistic | O'Neill | Oshawa | Ontario |
| Population | 14,521 | 176,009 | 14,804,681 |
| Population density (sq km) | 3,113 | 1,186 | 15 |
| Median age | 47.0 | 40.7 | 40.9 |
| Male/Female ratio | 1.1:1 | 1.0:1 | 1.0:1 |
| Married couples | 57% | 61% | 71% |
| Families w/ kids at home | 33% | 41% | 46% |
| Speak English only | 93.0% | 92.7% | 86.1% |
| Speak French only | 0.1% | 0.1% | 0.3% |
| Data | Percent |
| Black | 4.7% |
| South Asian | 2.9% |
| Chinese | 0.9% |
| Latin American | 0.8% |
| Arab | 0.8% |
| Data | Percent |
| United Kingdom | 2.7% |
| Other Caribbean And Bahamas | 0.6% |
| United States | 0.6% |
| Germany | 0.5% |
| Trinidad And Tobago | 0.5% |