| Statistic | Cousins Island | Maine | National |
| Population | 521 | 1,344,212 | 328,239,523 |
| Population density (sq mi) | 491 | 44 | 91 |
| Median age | 49.7 | 44.0 | 37.7 |
| Male/Female ratio | 1.3:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 86% | 57% | 55% |
| Families w/ Kids under 18 | 22% | 38% | 43% |
| Speak English | 100% | 94% | 79% |
| Speak Spanish | 0% | 1% | 13% |
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| Race | Cousins Island | Maine | National |
| White | 79.46% | 94.78% | 73.35% |
| Black | 0.00% | 1.23% | 12.63% |
| Asian | 0.00% | 1.10% | 5.22% |
| American Indian | 14.97% | 0.60% | 0.82% |
| Native Hawaiian | 0.00% | 0.02% | 0.18% |
| Mixed race | 5.57% | 2.04% | 3.06% |
| Other race | 0.00% | 0.24% | 4.75% |
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