| Statistic | Greenwich | New Brunswick | National |
| Population | 1,133 | 779,582 | 38,134,230 |
| Population density (sq km) | 9 | 11 | 4 |
| Median age | 51.8 | 45.7 | 40.9 |
| Male/Female ratio | 1.0:1 | 1.0:1 | 1.0:1 |
| Married couples | 74% | 66% | 66% |
| Families w/ kids at home | 35% | 37% | 43% |
| Speak English only | 92.4% | 57.5% | 68.8% |
| Speak French only | 0.0% | 7.9% | 4.5% |
| Data | Percent |
| N/A | 0.0% |
| Data | Percent |
| United Kingdom | 1.5% |
| United States | 0.6% |
| Germany | 0.4% |
| Other Western Europe | 0.3% |
| Netherlands | 0.2% |