| Statistic | New Tecumseth | Ontario | National |
| Population | 40,488 | 14,804,681 | 38,134,230 |
| Population density (sq km) | 140 | 15 | 4 |
| Median age | 42.5 | 40.9 | 40.9 |
| Male/Female ratio | 1.0:1 | 1.0:1 | 1.0:1 |
| Married couples | 70% | 71% | 66% |
| Families w/ kids at home | 43% | 46% | 43% |
| Speak English only | 94.3% | 86.1% | 68.8% |
| Speak French only | 0.0% | 0.3% | 4.5% |
| Data | Percent |
| South Asian | 2.4% |
| Black | 2.0% |
| Latin American | 1.0% |
| Chinese | 0.9% |
| Filipino | 0.7% |
| Data | Percent |
| United Kingdom | 3.2% |
| Italy | 1.1% |
| Germany | 0.9% |
| Poland | 0.5% |
| Portugal | 0.5% |