| Statistic | Mattawa | Ontario | National |
| Population | 2,126 | 14,804,681 | 38,134,230 |
| Population density (sq km) | 515 | 15 | 4 |
| Median age | 52.1 | 40.9 | 40.9 |
| Male/Female ratio | 1.1:1 | 1.0:1 | 1.0:1 |
| Married couples | 59% | 71% | 66% |
| Families w/ kids at home | 34% | 46% | 43% |
| Speak English only | 55.2% | 86.1% | 68.8% |
| Speak French only | 2.0% | 0.3% | 4.5% |
| Data | Percent |
| Chinese | 1.3% |
| Black | 1.0% |
| N/A | 0.0% |
| Data | Percent |
| United Kingdom | 0.7% |
| United States | 0.2% |
| Taiwan | 0.2% |
| Other Northern Europe | 0.2% |
| Colombia | 0.1% |