| PEOPLE | Castine | Carson | United States |
| Population | 1,366 | 91,714 | 308,035,306 |
| Pop. Density | 176 | 4,898 | 87 |
| Pop. Change | 1.71% | 2.45% | 8.07% |
| Median Age | 22.5 | 37.6 | 37.3 |
| Households | 380 | 25,432 | 116,716,292 |
| Household Size | 2.14 | 3.56 | 2.58 |
| Male Population | 66.54% | 47.89% | 49.27% |
| Female Population | 33.46% | 52.11% | 50.96% |
| Married Population | 27.71% | 41.62% | 47.02% |
| Single Population | 72.29% | 58.38% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 1.39% | 5.74% | 6.56% |
| Age 5 to 9 | 1.98% | 6.16% | 6.61% |
| Age 10 to 14 | 2.86% | 7.26% | 6.71% |
| Age 15 to 17 | 1.32% | 4.83% | 4.21% |
| Age 18 to 20 | 19.47% | 3.44% | 2.95% |
| Age 21 to 24 | 30.97% | 7.43% | 7.01% |
| Age 25 to 34 | 6.22% | 11.97% | 13.33% |
| Age 35 to 44 | 3.95% | 13.22% | 13.33% |
| Age 45 to 49 | 6.81% | 14.31% | 14.61% |
| Age 50 to 54 | 6.81% | 14.31% | 14.61% |
| Age 55 to 59 | 8.86% | 11.87% | 11.84% |
| Age 60 to 64 | 8.86% | 11.87% | 11.84% |
| Age 65 to 74 | 9.15% | 8.14% | 7.05% |
| Age 75 to 84 | 5.05% | 4.35% | 4.24% |
| Age 85 and over | 1.98% | 1.29% | 1.78% |
| RACE | | | |
| White | 96.71% | 23.84% | 72.41% |
| Black | 0.51% | 23.83% | 12.61% |
| Asian | 1.10% | 25.65% | 4.75% |
| American Indian | 0.15% | 0.56% | 0.95% |
| Other | 1.54% | 26.12% | 9.28% |
| Hispanic | 0.79% | 7.74% | 16.35% |
| Non-Hispanic | 99.21% | 92.26% | 83.65% |
| FAMILY | | | |
| Married, w/children | 23.83% | 30.04% | 30.42% |
| Married, no children | 62.69% | 38.37% | 42.46% |
| Single, w/children | 5.70% | 10.66% | 14.39% |
| Single, no children | 7.77% | 20.93% | 12.73% |
| Divorced | 5.30% | 7.87% | 10.62% |
| Separated | 2.57% | 8.10% | 4.97% |
| Widowed | 4.68% | 5.89% | 6.14% |
| Now Married | 27.77% | 41.29% | 46.32% |
| Never Married | 59.67% | 36.84% | 31.95% |
