| Statistic | Newmarket | Ontario | National |
| Population | 88,702 | 14,804,681 | 38,134,230 |
| Population density (sq km) | 2,331 | 15 | 4 |
| Median age | 40.6 | 40.9 | 40.9 |
| Male/Female ratio | 1.1:1 | 1.0:1 | 1.0:1 |
| Married couples | 73% | 71% | 66% |
| Families w/ kids at home | 53% | 46% | 43% |
| Speak English only | 90.2% | 86.1% | 68.8% |
| Speak French only | 0.0% | 0.3% | 4.5% |
| Data | Percent |
| Chinese | 8.5% |
| South Asian | 5.1% |
| Black | 3.3% |
| West Asian | 3.2% |
| Southeast Asian | 3.0% |
| Data | Percent |
| China | 3.2% |
| United Kingdom | 2.7% |
| Iran | 2.0% |
| Philippines | 1.7% |
| India | 1.1% |