| Statistic | Sainte-Marguerite-du-Lac-Masson | Quebec | National |
| Population | 2,972 | 8,565,732 | 38,134,230 |
| Population density (sq km) | 30 | 6 | 4 |
| Median age | 54.8 | 42.6 | 40.9 |
| Male/Female ratio | 0.9:1 | 1.0:1 | 1.0:1 |
| Married couples | 45% | 50% | 66% |
| Families w/ kids at home | 27% | 40% | 43% |
| Speak English only | 1.0% | 4.7% | 68.8% |
| Speak French only | 52.2% | 49.5% | 4.5% |
| Data | Percent |
| Latin American | 0.6% |
| Black | 0.5% |
| N/A | 0.0% |
| Data | Percent |
| France | 1.4% |
| Other Western Europe | 1.3% |
| Italy | 1.0% |
| Poland | 0.6% |
| Czech Republic | 0.3% |
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