| Statistic | Lafontaine Sud | Saint-Jérôme | Quebec |
| Population | 7,958 | 79,702 | 8,565,732 |
| Population density (sq km) | 1,794 | 866 | 6 |
| Median age | 46.2 | 44.6 | 42.6 |
| Male/Female ratio | 1.2:1 | 1.1:1 | 1.0:1 |
| Married couples | 40% | 41% | 50% |
| Families w/ kids at home | 29% | 35% | 40% |
| Speak English only | 0.1% | 0.3% | 4.7% |
| Speak French only | 65.2% | 63.3% | 49.5% |
| Data | Percent |
| Latin American | 1.4% |
| Arab | 1.2% |
| Black | 1.0% |
| West Asian | 0.5% |
| Southeast Asian | 0.4% |
| Data | Percent |
| Colombia | 0.7% |
| France | 0.6% |
| Morocco | 0.6% |
| Haiti | 0.3% |
| Algeria | 0.3% |
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