| PEOPLE | Seattle | Rockville | United States |
| Population | 608,660 | 61,209 | 308,035,306 |
| Pop. Density | 7,251 | 4,532 | 87 |
| Pop. Change | 9.49% | 32.00% | 8.07% |
| Median Age | 36.2 | 38.7 | 37.3 |
| Households | 283,510 | 23,686 | 116,716,292 |
| Household Size | 2.06 | 2.55 | 2.58 |
| Male Population | 49.95% | 47.93% | 49.27% |
| Female Population | 50.05% | 52.07% | 50.96% |
| Married Population | 34.51% | 48.58% | 47.02% |
| Single Population | 65.49% | 51.42% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 5.26% | 6.54% | 6.56% |
| Age 5 to 9 | 4.26% | 6.19% | 6.61% |
| Age 10 to 14 | 3.63% | 5.36% | 6.71% |
| Age 15 to 17 | 2.21% | 3.39% | 4.21% |
| Age 18 to 20 | 2.82% | 1.72% | 2.95% |
| Age 21 to 24 | 9.02% | 5.51% | 7.01% |
| Age 25 to 34 | 20.80% | 15.38% | 13.33% |
| Age 35 to 44 | 16.38% | 15.64% | 13.33% |
| Age 45 to 49 | 13.23% | 14.70% | 14.61% |
| Age 50 to 54 | 13.23% | 14.70% | 14.61% |
| Age 55 to 59 | 11.63% | 11.61% | 11.84% |
| Age 60 to 64 | 11.63% | 11.61% | 11.84% |
| Age 65 to 74 | 5.43% | 6.81% | 7.05% |
| Age 75 to 84 | 3.30% | 4.50% | 4.24% |
| Age 85 and over | 2.03% | 2.64% | 1.78% |
| RACE | | | |
| White | 69.48% | 60.40% | 72.41% |
| Black | 7.94% | 9.57% | 12.61% |
| Asian | 13.84% | 20.56% | 4.75% |
| American Indian | 0.79% | 0.33% | 0.95% |
| Other | 7.96% | 9.13% | 9.28% |
| Hispanic | 0.00% | 0.96% | 16.35% |
| Non-Hispanic | 100.00% | 99.04% | 83.65% |
| FAMILY | | | |
| Married, w/children | 30.43% | 36.39% | 30.42% |
| Married, no children | 45.60% | 43.38% | 42.46% |
| Single, w/children | 11.67% | 9.29% | 14.39% |
| Single, no children | 12.30% | 10.94% | 12.73% |
| Divorced | 12.30% | 9.04% | 10.62% |
| Separated | 5.21% | 6.82% | 4.97% |
| Widowed | 5.12% | 5.92% | 6.14% |
| Now Married | 34.43% | 47.85% | 46.32% |
| Never Married | 42.94% | 30.38% | 31.95% |
