| PEOPLE | Selden | United States |
| Population | 19,851 | 308,035,306 |
| Pop. Density | 4,594 | 87 |
| Pop. Change | -1.45% | 8.07% |
| Median Age | 37.1 | 37.3 |
| Households | 6,446 | 116,716,292 |
| Household Size | 3.08 | 2.58 |
| Male Population | 49.59% | 49.27% |
| Female Population | 50.41% | 50.96% |
| Married Population | 49.46% | 47.02% |
| Single Population | 50.54% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | |
| Age 0 to 4 | 5.81% | 6.56% |
| Age 5 to 9 | 6.58% | 6.61% |
| Age 10 to 14 | 7.21% | 6.71% |
| Age 15 to 17 | 5.01% | 4.21% |
| Age 18 to 20 | 2.79% | 2.95% |
| Age 21 to 24 | 6.70% | 7.01% |
| Age 25 to 34 | 13.08% | 13.33% |
| Age 35 to 44 | 14.93% | 13.33% |
| Age 45 to 49 | 16.26% | 14.61% |
| Age 50 to 54 | 16.26% | 14.61% |
| Age 55 to 59 | 10.63% | 11.84% |
| Age 60 to 64 | 10.63% | 11.84% |
| Age 65 to 74 | 6.43% | 7.05% |
| Age 75 to 84 | 3.43% | 4.24% |
| Age 85 and over | 1.13% | 1.78% |
| RACE | | |
| White | 86.04% | 72.41% |
| Black | 3.26% | 12.61% |
| Asian | 4.41% | 4.75% |
| American Indian | 0.16% | 0.95% |
| Other | 6.13% | 9.28% |
| Hispanic | 1.75% | 16.35% |
| Non-Hispanic | 98.25% | 83.65% |
| FAMILY | | |
| Married, w/children | 36.98% | 30.42% |
| Married, no children | 38.80% | 42.46% |
| Single, w/children | 10.43% | 14.39% |
| Single, no children | 13.78% | 12.73% |
| Divorced | 8.82% | 10.62% |
| Separated | 4.81% | 4.97% |
| Widowed | 6.28% | 6.14% |
| Now Married | 48.50% | 46.32% |
| Never Married | 31.59% | 31.95% |
