| Statistic | Markham | Ontario | National |
| Population | 359,111 | 14,804,681 | 38,134,230 |
| Population density (sq km) | 1,675 | 15 | 4 |
| Median age | 40.7 | 40.9 | 40.9 |
| Male/Female ratio | 1.0:1 | 1.0:1 | 1.0:1 |
| Married couples | 82% | 71% | 66% |
| Families w/ kids at home | 58% | 46% | 43% |
| Speak English only | 84.1% | 86.1% | 68.8% |
| Speak French only | 0.0% | 0.3% | 4.5% |
| Data | Percent |
| Chinese | 48.2% |
| South Asian | 18.8% |
| West Asian | 3.0% |
| Black | 2.9% |
| Filipino | 2.2% |
| Data | Percent |
| China | 18.9% |
| Hong Kong | 9.3% |
| India | 4.9% |
| Sri Lanka | 3.9% |
| Philippines | 2.4% |