| Statistic | Saint-Onésime | Saint-Onésime-d'Ixworth | Quebec |
| Population | 555 | 559 | 8,565,732 |
| Population density (sq km) | 5 | 5 | 6 |
| Median age | 49.1 | 49.1 | 42.6 |
| Male/Female ratio | 0.8:1 | 0.8:1 | 1.0:1 |
| Married couples | 49% | 49% | 50% |
| Families w/ kids at home | 39% | 39% | 40% |
| Speak English only | 0.0% | 0.0% | 4.7% |
| Speak French only | 86.9% | 86.9% | 49.5% |
| Data | Percent |
| N/A | 0.0% |
| Data | Percent |
| Other Southern Europe | 0.2% |
| N/A | 0.0% |