| Statistic | Sainte-Pétronille | Quebec | National |
| Population | 1,010 | 8,565,732 | 38,134,230 |
| Population density (sq km) | 200 | 6 | 4 |
| Median age | 54.4 | 42.6 | 40.9 |
| Male/Female ratio | 1.0:1 | 1.0:1 | 1.0:1 |
| Married couples | 52% | 50% | 66% |
| Families w/ kids at home | 33% | 40% | 43% |
| Speak English only | 0.2% | 4.7% | 68.8% |
| Speak French only | 54.2% | 49.5% | 4.5% |
| Data | Percent |
| Black | 1.7% |
| Filipino | 0.8% |
| N/A | 0.0% |
| Data | Percent |
| France | 3.8% |
| Other Western Europe | 1.0% |
| Italy | 0.3% |
| Germany | 0.3% |
| Algeria | 0.2% |